Now the acts of David the king, first and last, 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,
These verses bring king Solomon to his throne and king David to his grave. Thus the rising generation thrusts out that which went before, and says, "Make room for us." Every one has his day. I. Here is Solomon rising (Ch1 29:23): Solomon sat on the throne of the Lord.
Commenting on 1 Chronicles 29:23-30
Now the acts of David the king, first and last, 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, (o) The books of Nathan and Gad are thought to have been lost in the captivity.
The acts of David - first and last - Those which concerned him in private life, as well as those which grew out of his regal government. All these were written by three eminent men, personally acquainted with him through the principal part of his life; these were Samuel and Gad the seers, and Nathan the prophet.