Charles Ellicott Commentary Leviticus 22:3

"Say unto them, Whosoever he be of all your seed throughout your generations, that approacheth unto the holy things, which the children of Israel hallow unto Jehovah, having his uncleanness upon him, that soul shall be cut off from before me: I am Jehovah." — Leviticus 22:3 (ASV)

Whoever he is of all your seed, among your generations. —It is better translated, throughout your generations, every man. The Authorised Version correctly renders the expression translated here as “among your generations” in Leviticus 23:14; Leviticus 23:21. (Leviticus 21:17.)

Who goes to the holy things. —That is, who approaches the sacrifices to eat them, as is stated in Leviticus 22:4; Leviticus 22:6; Leviticus 22:12.

Having his uncleanness upon him. —Not having first submitted to the prescribed lustrations , the defilement that he contracted remains on him.

That soul shall be cut off from my presence. —This phrase, with the expression “from my presence,” does not occur again in the Pentateuch when the Lord threatens with the penalty of excision. In Leviticus, where, in addition to the passage before us, the penalty is enacted six times, the formula is always, “that soul shall be cut off from his people” (Leviticus 7:20–21; Leviticus 7:25; Leviticus 7:27; Leviticus 19:8; Leviticus 23:29).

Its exceptional form here may therefore refer to the particular circumstances. If the priest ventures to approach the altar presumptuously to partake of the holy sacrifices in a defiled state, God himself will banish him from His presence, just as He did to Nadab and Abihu.