1 Samuel 5:4-5

And when they arose early on the morrow morning, behold, Dagon {was} fallen upon his face to the ground before the ark of the LORD; and the head of Dagon and both the palms of his hands {were} cut off upon the threshold; only {the stump of} Dagon was left to him. {the stump...: or, the fishy part} Therefore neither the priests of Dagon, nor any that come into Dagon's house, tread on the threshold of Dagon in Ashdod unto this day.