1 Samuel 4:10-11

4:10 So the Philistines fought. Israel was defeated; they all ran home. The slaughter was very great; thirty thousand foot soldiers fell in battle. 4:11 The ark of God was taken, and the two sons of Eli, Hophni and Phineas, were killed.

1 Samuel 4:18

4:18 When he mentioned the ark of God, Eli fell backward from his chair beside the gate. He broke his neck and died, for he was old and heavy. He had judged Israel for forty years.