'Word of the Lord' in the Bible

Now that night the word of the Lord came to Nathan, saying,

Why then have you had no respect for the word of the Lord, doing what is evil in his eyes? You have put Uriah the Hittite to death with the sword, and have taken his wife to be your wife; you have put him to death with the sword of the children of Ammon.

And he sent word by Nathan the prophet, who gave him the name Jedidiah, by the word of the Lord.

As for God, his way is all good: the word of the Lord is tested; he is a safe cover for all those who put their faith in him.

And David got up in the morning; now the word of the Lord had come to the prophet Gad, David's seer, saying,