For when David was up in the morning, the word of the LORD came unto the prophet Gad, David's seer, saying, For when David was up - It is supposed that David's contrition arose from the reproof given by Gad, and that in the order of time the reproof came before the confession stated in the 10th verse.
David's seer - A holy man of God, under the Divine influence, whom David had as a domestic chaplain.