1 Samuel 31:4 (KJV)

And the Philistines followed hard upon Saul and upon his sons; and the Philistines slew Jonathan, and Abinadab, and Malchi–shua, Saul’s sons.

And the battle went sore against Saul, and the archers hit him; and he was sore wounded of the archers.

Then said Saul unto his armourbearer, Draw thy sword, and thrust me through therewith; lest these uncircumcised come and thrust me through, and abuse me. But his armourbearer would not; for he was sore afraid. Therefore Saul took a sword, and fell upon it.

And when his armourbearer saw that Saul was dead, he fell likewise upon his sword, and died with him.

So Saul died, and his three sons, and his armourbearer, and all his men, that same day together.