7 When Phinehas son of Eleazar and grandson of Aaron the priest saw this, he jumped up and left the assembly. He took a spear

Matthew Henry's Commentary on Numbers 25:7

Commentary on Numbers 25:6-15

(Read Numbers 25:6-15)

Phinehas, in the courage of zeal and faith, executed vengeance on Zimri and Cozbi. This act can never be an example for private revenge, or religious persecution, or for irregular public vengeance.