Numbers 25:6-9

6Then behold, a man from Bnei-Yisrael came and brought a Midianite woman to his brothers before the eyes of Moses and of the whole assembly of Bnei-Yisrael, while they were weeping at the entrance to the Tent of Meeting!

7When Phinehas son of Eleazar son of Aaron the kohen saw it, he arose from the midst of the assembly, took a spear in his hand,

8and went after the man of Israel into the tent and pierced them through—both the Israelite man and the woman’s belly. Then the plague among Bnei-Yisrael was stopped.

9However, 24,000 were dead because of the plague!