11 Then David took hold of his clothes and tore them, and so did all the men who were with him. 12 And they mourned and wept and fasted until evening for Saul and for Jonathan his son and for the people of the Lord and for the house of Israel, because they had fallen by the sword. 13 And David said to the young man who told him, "Where do you come from?" And he answered, "I am the son of a sojourner, an Amalekite." 14 David said to him, "How is it you were not afraid to put out your hand to destroy the Lord's anointed?" 15 Then David called one of the young men and said, "Go, execute him." And he struck him down so that he died. 16 And David said to him, "Your blood be on your head, for your own mouth has testified against you, saying, 'I have killed the Lord's anointed.'"
Matthew Henry's Commentary on 2 Samuel 1:11-16
Commentary on 2 Samuel 1:11-16
(Read 2 Samuel 1:11-16)
David was sincere in his mourning for Saul; and all with him humbled themselves under the hand of God, laid so heavily upon Israel by this defeat. The man who brought the tidings, David put to death, as a murderer of his prince. David herein did not do unjustly; the Amalekite confessed the crime. If he did as he said, he deserved to die for treason; and his lying to David, if indeed it were a lie, proved, as sooner or later that sin will prove, lying against himself. Hereby David showed himself zealous for public justice, without regard to his own private interest.