Numbers 25:3-7

³And Israel joined himself to Baal-Peor; and the anger of Jehovah was kindled against Israel.

⁴And Jehovah said to Moses, Take all the heads of the people, and hang them up to Jehovah before the sun, that the fierce anger of Jehovah may be turned away from Israel.

⁵And Moses said to the judges of Israel, Slay every one his men that have joined themselves to Baal-Peor.

⁶And behold, a man of the children of Israel came and brought a Midianitish woman to his brethren, in the sight of Moses, and in the sight of the whole assembly of the children of Israel, who were weeping before the entrance of the tent of meeting.

⁷And Phinehas, the son of Eleazar, the son of Aaron the priest, saw it, and rose up from among the assembly, and took a javelin in his hand,