Judges 16:23

Then the lords of the Philistines gathered them together for to offer a great sacrifice unto Dagon, their god, and to rejoice, as over a great victory, to be celebrated with a general feast of thanksgiving; for they said, Our god hath delivered Samson, our enemy, into our hand. Dagon was the chief idol of the Philistines, being worshiped not only at Gaza, but also at Ashdod; he was usually represented with the body of a fish, but with human head and hands.