Certain men - Probably Mishael and Elizaphan, who buried their cousins, Nadab and Abihu, within a week of this Passover Leviticus 10:4-5.
Related Commentaries of Numbers 9:6
Numbers 9:6
6 And there were certain men, who were defiled by the dead body of a man, that they could not keep the passover on that day: and they came before Moses and before Aaron on that day: