1 Samuel 31:4 Saul said to his armor-bearer, "Draw your sword and run me through, or these uncircumcised fellows will come and run me through and abuse me."
But his armor-bearer was terrified and would not do it; so Saul took his own sword and fell on it. 5 When the armor-bearer saw that Saul was dead, he too fell on his sword and died with him. 6 So Saul and his three sons and his armor-bearer and all his men died together that same day.
In the below passage David ordered an Amalekite to be killed as he said that he killed King Saul, but from the passage in 1 Samuel 31 it looks like King Saul died by falling onto his own sword. Why did the Amalekite man say that he killed King Saul? :
2 Samuel 1:5 Then David said to the young man who brought him the report, "How do you know that Saul and his son Jonathan are dead?"
6 "I happened to be on Mount Gilboa," the young man said, "and there was Saul, leaning on his spear, with the chariots and riders almost upon him. 7 When he turned around and saw me, he called out to me, and I said, 'What can I do?'
8 "He asked me, 'Who are you?'
" 'An Amalekite,' I answered.
9 "Then he said to me, 'Stand over me and kill me! I am in the throes of death, but I'm still alive.'
10 "So I stood over him and killed him, because I knew that after he had fallen he could not survive. And I took the crown that was on his head and the band on his arm and have brought them here to my lord."
11 Then David and all the men with him took hold of their clothes and tore them. 12 They mourned and wept and fasted till evening for Saul and his son Jonathan, and for the army of the LORD and the house of Israel, because they had fallen by the sword.
13 David said to the young man who brought him the report, "Where are you from?"
"I am the son of an alien, an Amalekite," he answered.
14 David asked him, "Why were you not afraid to lift your hand to destroy the LORD's anointed?"
15 Then David called one of his men and said, "Go, strike him down!" So he struck him down, and he died. 16 For David had said to him, "Your blood be on your own head. Your own mouth testified against you when you said, 'I killed the LORD's anointed.' "