The gentiles are rejecting Jesus for the second time - sudden destruction will come, page-12

The 'law of the prophets' is a set of guidlines for human behaviour as laid down in 'law.'
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It was binding on the nation dedicated to Jehovah.
(Exodus 19:3) Then Moses went up to the true God, and Jehovah called to him from the mountain, saying: “This is what you are to say to the house of Jacob and to tell the Israelites,

(Exodus 19:5) Now if you will strictly obey my voice and keep my covenant, you will certainly become my special property out of all peoples, for the whole earth belongs to me.

The Israelites agreed.
(Exodus 19:8) After that all the people answered unanimously: “All that Jehovah has spoken, we are willing to do.” Moses immediately took the people’s response to Jehovah.