Leviticus 27:13

But if the person vowing wanted to redeem it, he was to add a fifth above the valuation price, as a kind of compensation for taking back the animal he had vowed (cf. Lev 5:16).

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.).