Sforno on Numbers 16:5/ספורנו על במדבר ט״ז:ה׳

1וידבר אל קרח ואל כל עדתו, he informed them that he was sensitive to the trumped up nature of their charges and the rebellious nature of their complaints.

2את אשר לו, who was the one who spoke sincerely in honour of G’d (did not mouth pious sounding phrases only)

3ואת הקדוש והקריב אליו, He, G’d, Himself will make it plain who is entitled and worthy to offer sacrifices in His honour.

4ואת אשר יבחר בו יקריב אליו, only the worthy person G’d will select from all those taking part in this commotion. The meaning is reflected in G’d saying later to Moses: הבדלו מתוך העדה, “separate yourselves from among this congregation” (verse 21)