Halakhah for Menachot 146:6

Not to sacrifice a sacrifice that is one with a blemish from the hand of the stranger: Not to sacrifice [animals] with blemishes from the hands of gentiles, as it is stated (Leviticus 22:25), "And from the hand of the stranger you shall not offer the bread of your God from all of these" - such that we not say, "Since he is a gentile, we can sacrifice one with a blemish for his sake." And it required a warning about this for them, since the Torah already permitted us to accept unblemished sacrifices from them; as it is stated (Leviticus 22:18), "Every man from the House of Israel and from the sojourner in Israel that offers his sacrifice for all of their vows and for all of their pledges." And the explanation comes about this (Menachot 73b; Chullin 13b), "'Man' to include the gentiles that promise vows and pledges." And we accept it from them.