'Word of the Lord' in the Bible

In the first year of Cyrus king of Persia, that the word of the LORD spoken by the mouth of Jeremiah might be fulfilled, the LORD stirred up the spirit of Cyrus king of Persia, that he caused it to be proclaimed throughout all his empire, yea and by writing also, saying,

And there resorted unto me all such as feared the word of the LORD God of Israel, because of the great transgression. And I sat mourning until the evening sacrifice.