Numbers 25:7-8

Thomson(i) 7 Upon seeing this, Phineas, son of Eleazar, son of Aaron the priest, started up from among the congregation, and taking a javelin in his hand, 8 went after the man; the Israelite, into the bed chamber, and ran them both through, the man, the Israelite, quite through, and the woman into her belly. Whereupon the plague stopped from the children of Israel.