And when ye shall come into the land
The land of Canaan, whither they were now going: and shall have planted all manner of trees for food;
such that brought forth fruit that was eatable, as figs, grapes, olives so that all such trees as did not bear fruit fit for man's food came not under the following law; nor such as grew up of themselves and were not planted; nor such as were planted for any other use than for fruit; nor such as were planted by the Canaanites before the Israelites came into their land; for so say the Jews, what were planted for an hedge or for timber are free from the law; and add, at the time our fathers came into the land, what they found planted was free, what they planted, though they had not subdued it (the land), was bound: then ye shall count the fruit thereof as uncircumcised;
not fit to be eaten, but to be taken off and cast away as the foreskin of the flesh: three years it shall be as uncircumcised unto you, it shall not be
which was a provision partly for the benefit of fruit trees newly planted, whose fruit, when they first bear, gardeners frequently take off immediately, and do not suffer them to grow to any perfection, by which means a tree will grow stronger, and will bear more and better fruit another year; and partly for the health of man, which physical reason is given by Aben Ezra, who observes that the fruit that comes unto the third year there is no profit by it, but is hurtful; and chiefly because, as it is proper that the first fruits should be given to the Lord before any is eaten, so it is right that it should be given seasonably, and when it is brought to its perfection: three years were to be reckoned, as Jarchi and Ben Gersom say, from the time the tree was planted.