Leviticus 27:26

No man shall sanctify it By vow; because it is not his own, but the Lord's already, and therefore to vow such a thing to God is a tacit derogation from, and a usurpation of, the Lord's right, and a mocking of God by pretending to give what we cannot withhold from him. Ox or sheep Under these two eminent kinds he comprehends all other beasts which might be sacrificed to God, the firstlings whereof could not be redeemed, but were to be sacrificed; whereas the firstlings of men were to be redeemed, and therefore were capable of being vowed, as we see, 1

Samuel Leviticus 1:11.