Now the acts of David the king, first and last
All that he did that was memorable, both before he was king, and when king in Hebron, and then in Jerusalem:
behold, they 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;
which were journals of his life and actions, begun by Samuel, and carried on by Nathan and Gad; out of which what is recorded in canonical Scripture was taken by divine direction, and preserved, while other writings are lost; or rather the book of Samuel designs the first book of Samuel, and the books of Nathan and Gad the second book of Samuel, by whom it was written.