John Gills Exposition of the Bible Commentary - Deuteronomy 14:22
Thou shalt truly tithe all the increase of thy seed ,.... This was a different tithe from that which was made and given to the Levites, and out of which a tithe was taken and given to the priests, and which they only ate of; but this, as appears by the following verse, was what the owners themselves ate of, and so the tithing was left to be made by them themselves, and which they were to be sure to make, and to make it truly and faithfully: that the field bringeth forth year by year ;... read more
Matthew Henry's Complete Commentary - Deuteronomy 14:22-29
We have here a part of the statute concerning tithes. The productions of the ground were twice tithed, so that, putting both together, a fifth part was devoted to God out of their increase, and only four parts of five were for their own common use; and they could not but own they paid an easy rent, especially since God's part was disposed of to their own benefit and advantage. The first tithe was for the maintenance of their Levites, who taught them the good knowledge of God, and ministered to... read more