1 Samuel 4:10, 11, 18

So the Philistines fought, and the Israelites were defeated and every man fled to his tent. The slaughter was very great; Israel lost thirty thousand foot soldiers.

The ark of God was captured, and Eli’s two sons, Hophni and Phinehas, died.

When he mentioned the ark of God, Eli fell backward off his chair by the side of the gate. His neck was broken and he died, for he was an old man, and he was heavy. He had led Israel forty years.