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. These writings are all lost, except the particulars interspersed in the books of Samuel, Kings, and Chronicles, none of which are the records mentioned here.
On the character of the works alluded to, see Introduction to Chronicles.
Gad the seer - Gad is not given here the same title as Samuel. Samuel‘s title is one, apparently, of higher dignity, applied only to him and to Hanani 2 Chronicles 16:7, 2 Chronicles 16:10. Gad‘s is a far commoner title; it is applied to his contemporaries Asaph 2 Chronicles 29:30, Heman 1 Chronicles 25:5, and Jeduthun 2 Chronicles 35:15, to Iddo 2 Chronicles 9:29; 2 Chronicles 12:15, to Jehu, the son of Hanani 2 Chronicles 19:2, and to the prophet Amos Amos 7:12. When “seers” are spoken of in the plural, it is the term almost universally used, only one instance Isaiah 30:10 occurring to the contrary.