Matthew Poole and continuators on Leviticus 19:23

23 And when ye shall come into the land, and shall have planted all manner of trees for food; then ye shall count the fruit thereof as uncircumcised : three years shall it be as uncircumcised unto you: it shall not be eaten of.

(i. e.) As unclean, not to be eaten but cast away, and counted abhominable, as the foreskins are.

This precept was serviceable, 1. To the trees themselves, which grew the better and faster being early stript of those fruits, which otherwise would have derived to themselves and drawn away much more of the strength from the root and tree. 2. To men, both because the fruit then was waterish, indigested and unwholesome, and because hereby men were taught to bridle their appetites, a lesson of great use and absolute necessity in a godly life. 3. To God, who required and deserved the first-fruits, which must be also of the best, and so they could not be in this time.