bible allow religious killing worse than islam

I have previously questioned Director12, who confirmed all 'killing' is not 'murder' according to the bible

in Exodus 32, Moses comes down from Mt Sinai, with tablets having the 10 commandments engraved on them, which include the commandment: "Thou shall not kill/murder"

seeing the Israelite people had created a new god, Moses order these people be killed, of which 3,000 were killed

therefore, how is this commandment: "Thou shall not kill/murder" to be interpreted?

thanks



Exodus 32

American Standard Version (ASV)

Moses turned, and went down from the mount, with the two tables of the testimony in his hand; tables that were written on both their sides; on the one side and on the other were they written.

16 And the tables were the work of God, and the writing was the writing of God, graven upon the tables.

19 And it came to pass, as soon as he came nigh unto the camp, that he saw the calf and the dancing: and Moses' anger waxed hot, and he cast the tables out of his hands, and brake them beneath the mount.

20 And he took the calf which they had made, and burnt it with fire, and ground it to powder, and strewed it upon the water, and made the children of Israel drink of it.

26 then Moses stood in the gate of the camp, and said, Whoso is on Jehovah's side, let him come unto me. And all the sons of Levi gathered themselves together unto him.

27 And he said unto them, Thus saith Jehovah, the God of Israel, Put ye every man his sword upon his thigh, and go to and fro from gate to gate throughout the camp, and slay every man his brother, and every man his companion, and every man his neighbor.

28 And the sons of Levi did according to the word of Moses: and there fell of the people that day about three thousand men.

http://www.biblegateway.com/passage/?search=Exodus%2032&version=ASV