Leviticus 25:22

“And ye shall sow the eighth year, etc.] Sow the land in the eighth year, and likewise dress their vines, olives, etc. and eat [yet] of the old fruit; even in the eighth year, of the old fruit of the sixth year, as the Targum of Jonathan adds: until the ninth year; that is, as Jarchi explains it, until the feast of tabernacles of the ninth, which was the time that the increase of the eighth came into the house; for all summer it was in the field, and in Tisri or September was the time of gathering it into the house; and sometimes it was necessary to provide for four years on the sixth, which was before the sabbatical year, the seventh, for they ceased from tilling the ground two years…”

“Old fruit - Of the sixth year principally, if not solely. Leviticus 25:23”

“eighth: Kg2 19:29; Isa 37:30 old fruit: Jos 5:11, Jos 5:12 Leviticus 25:23”