Fear God, and keep his commandments: for this is the whole duty of man.

13 Let us hear the conclusion of the whole matter: Fear God, and keep his commandments: for this is the whole duty of man.
14 For God shall bring every work into judgment, with every secret thing, whether it be good, or whether it be evil.

(Ecclesiastes 12:13-14)

As we know the Fear of God is the beginning of knowledge (Proverbs 1:7) and the Ten Commandments were known and obeyed by faithful people before the law was given at Sinai. Later incorporated into the new covenant, they constitute the basic moral code for humanity (as further explained by Jesus) and are obeyed to demonstrate the believer’s love for God and his fellow man.



Some relevant scripture:

	3 And hereby we do know that we know him, if we keep his commandments.
1	4 He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him.
2	5 But whoso keepeth his word, in him verily is the love of God perfected: hereby know we that we are in him.
3	6 He that saith he abideth in him ought himself also so to walk, even as he walked.
4	(1 John 2:3-6)
5
6	If ye love me, keep my commandments.
7	(John 14:15)
8
9	9 And the third angel followed them, saying with a loud voice, If any man worship the beast and his image, and receive his mark in his forehead, or in his hand,
10	10 the same shall drink of the wine of the wrath of God, which is poured out without mixture into the cup of his indignation; and he shall be tormented with fire and brimstone in the presence of the holy angels, and in the presence of the Lamb:
11	11 and the smoke of their torment ascendeth up for ever and ever: and they have no rest day nor night, who worship the beast and his image, and whosoever receiveth the mark of his name.
12	12 Here is the patience of the saints: here are they that keep the commandments of God, and the faith of Jesus.
13	(Revelation 14:9-12)
14
15	3 For this is the love of God, that we keep His commandments; and His commandments are not burdensome.
16	(1 John 5:3)
17
18	21 He that hath my commandments, and keepeth them, he it is that loveth me: and he that loveth me shall be loved of my Father, and I will love him, and will manifest myself to him.
19	(John 14:21)
20
21	10 If ye keep my commandments, ye shall abide in my love; even as I have kept my Father's commandments, and abide in his love.
22	(John 15:10)
23
24	19 Circumcision is nothing, and uncircumcision is nothing, but the keeping of the commandments of God.
25	(1 Corinthians 7:19)
26
27	24 And he that keepeth his commandments dwelleth in him, and he in him. And hereby we know that he abideth in us, by the Spirit which he hath given us.
28	(1 John 3:24)
29
30	17 And the dragon was wroth with the woman, and went to make war with the remnant of her seed, which keep the commandments of God, and have the testimony of Jesus Christ.
31	(Revelation 12:17)
32
33	14 Blessed are they that do his commandments, that they may have right to the tree of life, and may enter in through the gates into the city.
34	(Revelation 22:14)
35
36	8 But we know that the law is good, if a man use it lawfully;
37	9 Knowing this, that the law is not made for a righteous man, but for the lawless and disobedient, for the ungodly and for sinners, for unholy and profane, for murderers of fathers and murderers of mothers, for manslayers,
38	10 For whoremongers, for them that defile themselves with mankind, for menstealers, for liars, for perjured persons, and if there be any other thing that is contrary to sound doctrine;
39	11 According to the glorious gospel of the blessed God, which was committed to my trust.
40	(1 Timothy 1:8-11)
41
42	17 Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil.
43	18 For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.
44	19 Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven.
45	20 For I say unto you, That except your righteousness shall exceed the righteousness of the scribes and Pharisees, ye shall in no case enter into the kingdom of heaven.
46	21 Ye have heard that it was said by them of old time, Thou shalt not kill; and whosoever shall kill shall be in danger of the judgment:
47	22 But I say unto you, That whosoever is angry with his brother without a cause shall be in danger of the judgment: and whosoever shall say to his brother, Raca, shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of hell fire.
48	23 Therefore if thou bring thy gift to the altar, and there rememberest that thy brother hath ought against thee;
49	24 Leave there thy gift before the altar, and go thy way; first be reconciled to thy brother, and then come and offer thy gift.
50	25 Agree with thine adversary quickly, whiles thou art in the way with him; lest at any time the adversary deliver thee to the judge, and the judge deliver thee to the officer, and thou be cast into prison.
51	26 Verily I say unto thee, Thou shalt by no means come out thence, till thou hast paid the uttermost farthing.
52	27 Ye have heard that it was said by them of old time, Thou shalt not commit adultery:
53	28 But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart.
54	29 And if thy right eye offend thee, pluck it out, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell.
55	30 And if thy right hand offend thee, cut it off, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell.
56	31 It hath been said, Whosoever shall put away his wife, let him give her a writing of divorcement:
57	32 But I say unto you, That whosoever shall put away his wife, saving for the cause of fornication, causeth her to commit adultery: and whosoever shall marry her that is divorced committeth adultery.
58	33 Again, ye have heard that it hath been said by them of old time, Thou shalt not forswear thyself, but shalt perform unto the Lord thine oaths:
59	34 But I say unto you, Swear not at all; neither by heaven; for it is God's throne:
60	35 Nor by the earth; for it is his footstool: neither by Jerusalem; for it is the city of the great King.
61	36 Neither shalt thou swear by thy head, because thou canst not make one hair white or black.
62	37 But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.
63	38 Ye have heard that it hath been said, An eye for an eye, and a tooth for a tooth:
64	39 But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also.
65	40 And if any man will sue thee at the law, and take away thy coat, let him have thy cloke also.
66	41 And whosoever shall compel thee to go a mile, go with him twain.
67	42 Give to him that asketh thee, and from him that would borrow of thee turn not thou away.
68	43 Ye have heard that it hath been said, Thou shalt love thy neighbour, and hate thine enemy.
69	44 But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
70	45 That ye may be the children of your Father which is in heaven: for he maketh his sun to rise on the evil and on the good, and sendeth rain on the just and on the unjust.
71	46 For if ye love them which love you, what reward have ye? do not even the publicans the same?
72	47 And if ye salute your brethren only, what do ye more than others? do not even the publicans so?
73	48 Be ye therefore perfect, even as your Father which is in heaven is perfect.
74	(Matthew 5:17-48)
75
76	21 Wherefore lay apart all filthiness and superfluity of naughtiness, and receive with meekness the engrafted word, which is able to save your souls.
77	22 But be ye doers of the word, and not hearers only, deceiving your own selves.
78	23 For if any be a hearer of the word, and not a doer, he is like unto a man beholding his natural face in a glass:
79	24 For he beholdeth himself, and goeth his way, and straightway forgetteth what manner of man he was.
80	25 But whoso looketh into the perfect law of liberty, and continueth therein, he being not a forgetful hearer, but a doer of the work, this man shall be blessed in his deed.
81	26 If any man among you seem to be religious, and bridleth not his tongue, but deceiveth his own heart, this man's religion is vain.
82	27 Pure religion and undefiled before God and the Father is this, To visit the fatherless and widows in their affliction, and to keep himself unspotted from the world.
83	(James 1:21-27)
84
85	26 For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins,
86	27 But a certain fearful looking for of judgment and fiery indignation, which shall devour the adversaries.
87	28 He that despised Moses' law died without mercy under two or three witnesses:
88	29 Of how much sorer punishment, suppose ye, shall he be thought worthy, who hath trodden under foot the Son of God, and hath counted the blood of the covenant, wherewith he was sanctified, an unholy thing, and hath done despite unto the Spirit of grace?
89	30 For we know him that hath said, Vengeance belongeth unto me, I will recompense, saith the Lord. And again, The Lord shall judge his people.
90	31 It is a fearful thing to fall into the hands of the living God.
91	(Hebrews 10:26-31)
92
93	4 For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost,
94	5 And have tasted the good word of God, and the powers of the world to come,
95	6 If they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame.
96	(Hebrews 6:4-6)