'Word of the Lord' in the Bible

Now Samuel did not yet know the Lord; the word of the Lord had not yet been revealed to him.

Then the Lord again appeared in Shiloh, for it was in Shiloh that the Lord had revealed himself to Samuel through the word of the Lord.

Then the word of the Lord came to Samuel:

For rebellion is like the sin of divination, and presumption is like the evil of idolatry. Because you have rejected the word of the Lord, he has rejected you as king."

Samuel said to Saul, "I will not go back with you, for you have rejected the word of the Lord, and the Lord has rejected you from being king over Israel!"