1 Chronicles 10:2-6

And the Philistines followed hard after Saul, and after his sons; and the Philistines slew Jonathan, and Abinadab, and Malchi-shua, the sons of Saul.

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

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

And when his armourbearer saw that Saul was dead, he fell likewise on the sword, and died.

So Saul died, and his three sons, and all his house died together.