30 "One-tenth of the produce of the land, whether grain from the fields or fruit from the trees, belongs to the Lord and must be set apart to him as holy. 31 If you want to buy back the Lord 's tenth of the grain or fruit, you must pay its value, plus 20 percent. 32 Count off every tenth animal from your herds and flocks and set them apart for the Lord as holy. 33 You may not pick and choose between good and bad animals, and you may not substitute one for another. But if you do exchange one animal for another, then both the original animal and its substitute will be considered holy and cannot be bought back." 34 These are the commands that the Lord gave through Moses on Mount Sinai for the Israelites.

Matthew Henry's Commentary on Leviticus 27:30-34

Commentary on Leviticus 27:26-33

(Read Leviticus 27:26-33)

Things or persons devoted, are distinguished from things or persons that were only sanctified. Devoted things were most holy to the Lord, and could neither be taken back nor applied to other purposes. Whatever productions they had the benefit, God must be honoured with the tenth of, if it could be applied. Thus they acknowledge God to be the Owner of their land, the Giver of its fruits, and themselves to be his tenants, and dependants upon him. Thus they gave him thanks for the plenty they enjoyed, and besought his favour in the continuance of it. We are taught to honour the Lord with our substance.

Commentary on Leviticus 27:34

(Read Leviticus 27:34)

The last verse seems to have reference to this whole book. Many of the precepts in it are moral, and always binding; others are ceremonial, and peculiar to the Jewish nation; yet they have a spiritual meaning, and so teach us; for unto us, by these institutions, is the gospel preached, as well as unto them, Hebrews 4:2. The doctrine of reconciliation to God by a Mediator, is not clouded with the smoke of burning sacrifice, but cleared by the knowledge of Christ and him crucified. We are under the sweet and easy institutions of the gospel, which pronounces those true worshippers, who worship the Father in spirit and truth, by Christ only, and in his name. Yet, let us not think, because we are not tied to the ceremonial rites and oblations, that a little care, time, and expense, will serve to honour God with. Having boldness to enter into the holiest by the blood of Jesus, let us draw near with a true heart, and in full assurance of faith, worshipping God with the more cheerfulness and humble confidence, still saying, BLESSED BE GOD FOR JESUS CHRIST.