Psalms 106:31 - Matthew Poole's English Annotations on the Holy Bible

And although that action of his might seem harsh, and rash, and irregular, as being done by a private person and a priest, and as allowing the delinquents no space for repentance, it was accepted and rewarded by God as an act of justice and piety agreeable to his mind, and proceeding from a sincere zeal for God's honour, and for the good of God's people; and God gave him a public testimony of his approbation to be recorded to all generations, and the priesthood to be continued to him and his in all succeeding generations, of all which see Num 25.