11 If it is an unclean animal which they do not offer as a sacrifice to the Lord, then he shall present the animal before the priest; 12 and the priest shall set a value for it, whether it is good or bad; as you, the priest, value it, so it shall be. 13 But if he wants at all to redeem it, then he must add one-fifth to your valuation.
Matthew Henry's Commentary on Leviticus 27:11-13
Commentary on Leviticus 27:1-13
(Read Leviticus 27:1-13)
Zeal for the service of God disposed the Israelites, on some occasions, to dedicate themselves or their children to the service of the Lord, in his house for life. Some persons who thus dedicated themselves might be employed as assistants; in general they were to be redeemed for a value. It is good to be zealously affected and liberally disposed for the Lord's service; but the matter should be well weighed, and prudence should direct as to what we do; else rash vows and hesitation in doing them will dishonour God, and trouble our own minds.