Suddenly an angel appeared to David advancing on Jerusalem, with a drawn sword, so that he would ask for forgiveness. The very words of the king are worthy of admiration. For he says: Lo, I have sinned, I the shepherd have done wickedly: but these sheep, what have they done? let thine hand, I pray thee, be against me, and against my father’s house. (II Kgdms. 24:17). David, not knowing the reason, called what had happened his own sin and begged him to pronounce a true sentence upon him and on his family, expressing himself as a true shepherd and imitating his Son and the Lord, who laid down His life for the sheep.
Blessed Theodoret (+457), Commentary on II Kingdoms
Fifth Century