2 Samuel 1:9-19

9 Then he said to me, Come here to my side, and put me to death, for the pain of death has me in its grip but my life is still strong in me.
10 So I put my foot on him and gave him his death-blow, because I was certain that he would not go on living after his fall: and I took the crown from his head and the band from his arm, and I have them here for my lord.
11 Then David gave way to bitter grief, and so did all the men who were with him:
12 And till evening they gave themselves to sorrow and weeping, and took no food, weeping for Saul and for Jonathan, his son, and for the people of the Lord and for the men of Israel; because they had come to their end by the sword.
13 And David said to the young man who had given him the news, Where do you come from? And he said, I am the son of a man from a strange land; I am an Amalekite.
14 And David said to him, Had you no fear of stretching out your hand to put to death the one marked with the holy oil?
15 And David sent for one of his young men and said, Go near and put an end to him. And he put him to death.
16 And David said to him, May your blood be on your head; for your mouth has given witness against you, saying, I have put to death the man marked with the holy oil.
17 Then David made this song of grief for Saul and Jonathan, his son:
18 (It is recorded in the book of Jashar for teaching to the sons of Judah) and he said:
19 The glory, O Israel, is dead on your high places! How have the great ones been made low!