2,729. Can One Vow Sin Offerings and Guilt Offerings?

Hilchos Nedarim 1:10

Sin offerings and guilt offerings aren’t brought as vows or donations, as will be discussed IY”H in Hilchos Maaseh HaKorbanos. However, it’s still possible that a person might make a vow to offer such sacrifices as a consequence of his vow. Specifically, one who takes a nazirite vow must bring a sin offering upon completion of his nazir period, and a guilt offering if he should be rendered impure. Therefore, if one declares produce to be like a sin offering or like a guilt offering to him, or if he says, “It is a sin offering/guilt offering,” it becomes prohibited. Certainly, if he declares it a burnt offering, peace offering, flour offering or a thanksgiving offering it becomes prohibited because all of these offerings can be brought as vows or as donations.

Hilchos Nedarim 1:11

If a person declares, “This produce is to me like the challah of Aaron” or “...like his trumah,” it remains permitted because there’s no way for these things to be brought as vows or donations.