And he set the Levites in the house of the Lord with cymbals, and psalteries, and harps according to the regulation of David the king, and of Gad the seer, and of Nathan the prophet: for it was the commandment of the Lord by the hand of his prophets.
Now the acts of king David first and last are written in the book of Samuel the seer, and in the book of Nathan the prophet, and in the book of Gad the seer: