In the year of this jubilee,.... In the beginning of it, as Aben Ezra, though not on the first day of Tisri, but the tenth day, the day of atonement, when the trumpet was blown:
ye shall return every man unto his possession; which is repeated from Leviticus 25:10; the reason of which, the Jews say, is to include gifts, and which, according to them, are like sales, and returned in the year of "jubilee"; that is, if a man gave his estate in possession to another, he returned to it, in the year of jubilee, equally as if he had sold it; and therefore they observe the same phrase is twice used by Moses, to include gifts (y): but perhaps the truer reason is, because this was a special business done at this time, and of great importance; the word "return" being so often used, may serve to confirm the sense of the word "jubilee", given previously; see Gill on Leviticus 25:9.
(y) Misn. Becorot, c. 8. sect. 10. & Bartenora in ib.

ye shall return every man unto his possession, &c.--Inheritances, from whatever cause, and how frequently soever they had been alienated, came back into the hands of the original proprietors. This law of entail, by which the right heir could never be excluded, was a provision of great wisdom for preserving families and tribes perfectly distinct, and their genealogies faithfully recorded, in order that all might have evidence to establish their right to the ancestral property. Hence the tribe and family of Christ were readily discovered at his birth.