Charles Ellicott Commentary Leviticus 22:18

"Speak unto Aaron, and to his sons, and unto all the children of Israel, and say unto them, Whosoever he be of the house of Israel, or of the sojourners in Israel, that offereth his oblation, whether it be any of their vows, or any of their freewill-offerings, which they offer unto Jehovah for a burnt-offering;" — Leviticus 22:18 (ASV)

And to all the children of Israel. — As the following laws presented the condition of the animals which the Israelites are to offer, they are addressed to the laity as well as to the priests.

Whatsoever he be. — Better, what man soever there be, as it is translated in the Authorised version Leviticus 17:3 (and see Note on Leviticus 17:8).

Offer his oblation. — Better, offer his offering, as the Authorised version translates it in Leviticus 3:7; Leviticus 3:14; Leviticus 7:12; Leviticus 17:4, etc. It is difficult to discern why the translators provided a different rendering here of a fixed sacrificial formula, which it is important to reproduce uniformly in a translation.

For all his vows, and for all his freewill offerings. — Better, for any manner of vow, or for any manner of freewill offering. That is, if an Israelite by race, or one who was originally a stranger but has joined the Jewish community, brings a sacrifice, be it in consequence of a vow he has made, or be it a freewill offering. Both these kinds of sacrifices were entirely voluntary, and the difference between them is described in Leviticus 7:16.