פנחס בן אלעזר בן אהרן הכהן השיב את חמתי מעל בני ישראל בקנאו את קנאתי בתוכם
Pinchas did not act in a vacuum. The entire nation witnessed his actions. What were they doing? Some were (of course) complaining and disparaging his lineage, claiming that his motives were impure. According to Targum Yonasan, the rest cried and recited Krias Shema. They cried, explains Chezkuni, because Moshe Rabbeinu had instructed them to kill the perpetrators who had sinned with the Midyanite women. It was a difficult order to carry out. Shevet Levi, who were once again empowered to be the righteous executioners, did not seem to have an issue (earlier) when the order came to kill the offenders…