Judges 3:15

15. But when Israel cried out to the LORD for help, the LORD raised up a man to rescue them. His name was Ehud son of Gera, of the tribe of Benjamin, who was left-handed. The Israelites sent Ehud to deliver their tax money to King Eglon of Moab.
16. So Ehud made himself a double-edged dagger that was eighteen inches long, and he strapped it to his right thigh, keeping it hidden under his clothing.
17. He brought the tax money to Eglon, who was very fat.
18. After delivering the payment, Ehud sent home those who had carried the tax money.
19. But when Ehud reached the stone carvings near Gilgal, he turned back. He came to Eglon and said, "I have a secret message for you." So the king commanded his servants to be silent and sent them all out of the room.