Charles Ellicott Commentary Leviticus 25:20

"And if ye shall say, What shall we eat the seventh year? Behold, we shall not sow, nor gather in our increase;" — Leviticus 25:20 (ASV)

What shall we eat the seventh year? —The Lawgiver here anticipates an objection on the part of those who are called upon to abstain from cultivating the land in the sabbatical year, and who are overanxious about the provisions of their families.

Behold, we shall not sow. —That is, are forbidden to sow. (See Leviticus 25:4.)

Nor gather in our increase. —That is, we are even prohibited to gather the spontaneous growths and store them up, and are commanded to leave “the increase” in the field. (See Leviticus 25:7.)