1 Samuel 31:2-4

2And the Philistines overtook Saul and his sons, and the Philistines struck down Jonathan and Abinadab and Malchi-shua, the sons of Saul.

3The battle pressed hard against Saul, and the archers found him, and he was badly wounded by the archers.

4Then Saul said to his armor-bearer, "Draw your sword, and thrust me through with it, lest these uncircumcised come and thrust me through, and mistreat me." But his armor-bearer would not, for he feared greatly. Therefore Saul took his own sword and fell upon it.