Левит 27:9

When animals were vowed, of the cattle that were usually offered in sacrifice, everything that was given to Jehovah of these (i.e., dedicated to Him by vowing) was to be holy and not changed, i.e., exchanged, a good animal for a bad, or a bad one for a good. But if such an exchange should be made, the animal first dedicated and the one substituted were both to be holy (Lev 27:9, Lev 27:10). The expression "it shall be holy" unquestionably implies that an animal of this kind could not be redeemed; but if it was free from faults, it was offered in sacrifice: if, however, it was not fit for sacrifice on account of some blemish, it fell to the portion of the priests for their maintenance like the first-born of cattle (cf. Lev 27:33).

The last verse of the foregoing chapter seemed to close up the statute-book; yet this chapter is added as an appendix. Having given laws concerning instituted services, here he directs concerning vows and voluntary services, the free-will offerings of their mouth. Perhaps some devout serious people among them might be so affected with what Moses had delivered to them in the foregoing chapter as in a pang of zeal to consecrate themselves, or their children, or estates to him: this, because honestly meant, God would accept; but, because men are apt to repent of such vows, he leaves room for the redemption of what had been so consecrated, at a certain rate. Here is, I. The law concerning what was sanctified to God, persons (Lev 27:2-8), cattle, clean or unclean (Lev 27:9-13), houses and lands (Lev 27:15-25), with an exception of firstlings, (Lev 27:26, Lev 27:27). II. Concerning what was devoted (Lev 27:28, Lev 27:29). III. Concerning tithes (Lev 27:30, etc.).

27:9-10 Once an acceptable animal had been vowed and the priest at the sanctuary had accepted it on God’s behalf, the animal became holy and belonged to God.