John Calvin Commentary Numbers 25:14

"Now the name of the man of Israel that was slain, who was slain with the Midianitish woman, was Zimri, the son of Salu, a prince of a fathers` house among the Simeonites." — Numbers 25:14 (ASV)

Now the name of the Israelite. Just as the memory of the righteous is blessed, so also it was fitting that the author of this foul sin should be condemned to perpetual infamy. It appears, however, from the fact that a part of the disgrace was cast upon the whole tribe, how greatly displeasing this gross enormity was to God. For although the tribe of Simeon is not actually charged here with participating in the sin, yet they are all branded with the common mark of ignominy for their humiliation, so that each one of them may learn to severely correct whoever among his relatives he may see offending, and by no means to encourage their vices, if he desires to honor the founder of his lineage.¹⁸⁹

It is recorded that both Zimri and the Midianitish woman were from noble and prominent families. This serves not only to teach us that God’s judgment is no respecter of persons (ἀπροσωπόληπτον), as it does not spare rank, but also that the higher a person is in position, the greater the disgrace they face if they behave dishonorably, since their very dignity makes their actions more conspicuous.

Because the harlot's paternal house is said to have been in Midian, some conjecture that she was born in the land of Moab, or, at any rate, brought up there among her maternal relatives; but, since the matter is unimportant, I leave it undecided.

¹⁸⁹ “Car e’est le vray moyen d’honorer sa famille et son sang;” for this is the true way to honor one’s family and blood. — Fr..