1 Samuel 5:1-5

Then the Philistines took the ark of God, and they brought it from Ebenezer to Ashdod. They took the ark of God and brought it into the house of Dagon and set it beside [the image of] Dagon [their chief idol]. When the people of Ashdod got up early the next day, behold, Dagon had fallen on his face on the ground before the ark of the LORD. So they took Dagon and returned him to his place. But when they got up early the next morning, behold, Dagon had [again] fallen on his face on the ground before the ark of the LORD, and his head and both palms of his hands were [lying] cut off on the threshold; only the trunk [portion] of [the idol of] Dagon was left on him. This is the reason neither the priests of Dagon nor any who enter Dagon’s house step on the threshold of Dagon in Ashdod to this day.