Numbers 25:2-8

The women invited them to their sacrifices to their gods, and the Israelites ate food there and worshiped these gods. So the Israelites began to worship Baal of Peor, and the LORD was very angry with them. The LORD said to Moses, “Get all the leaders of the people and kill them in open daylight in the presence of the LORD. Then the LORD will not be angry with the people of Israel.” So Moses said to Israel’s judges, “Each of you must put to death your people who have become worshipers of Baal of Peor.” Moses and the Israelites were gathered at the entrance to the Meeting Tent, crying there. Then an Israelite man brought a Midianite woman to his brothers in plain sight of Moses and all the people. Phinehas son of Eleazar, the son of Aaron, the priest, saw this, so he left the meeting and got his spear. He followed the Israelite into his tent and drove his spear through both the Israelite man and the Midianite woman. Then the terrible sickness among the Israelites stopped.