'Word of the Lord' in the Bible

The word of the Lord came to me, saying,

The word of the Lord came to you face to face on the mountain, out of the heart of the fire,

(I stood between the LORD and you at that time, to shew you the word of the LORD: for ye were afraid by reason of the fire, and went not up into the mount;) saying,

From the day when I first had knowledge of you, you have gone against the word of the Lord.

When a prophet makes a statement in the name of the Lord, if what he says does not take place and his words do not come true, then his word is not the word of the Lord: the words of the prophet were said in the pride of his heart, and you are to have no fear of him.

So Moses the servant of the LORD died there in the land of Moab, according to the word of the LORD.