Numbers 25:1-5

While Israel remained at Shittim, the people began to play the harlot with the daughters of Moab. For they invited the people to the sacrifices of their gods, and the people ate and bowed down to their gods. So Israel joined themselves to Baal of Peor, and the LORD was angry against Israel. The LORD said to Moses, “Take all the leaders of the people and execute them in broad daylight before the LORD, so that the fierce anger of the LORD may turn away from Israel.” So Moses said to the judges of Israel, “Each of you slay his men who have joined themselves to Baal of Peor.”