But if you say: What shall we eat the seventh year, if we sow not, nor gather our fruits?

And if ye say, What shall we eat in the seventh year? behold, we may not sow, nor gather in our produce;

And if you say, Where will our food come from in the seventh year, when we may not put in seed, or get in the increase

Quod si dixeritis, Quid edemus anno septimo, si neque seminabimus, nec colligemus fruges nostras?

And if ye shall say. Men will never be obedient to God's precepts, unless their distrust of Him is corrected, and will be always ingenious in laying hold of pretexts for disobedience. The difficulty, however, in this matter was a specious excuse for the Jews; for famine might have destroyed them in these two years, since in the seventh year they neither sowed nor reaped; and for reaping they were obliged to wait till the end of the eighth year. Now, whence were they to get seed enough to sow after the land had rested for a whole year? It is not without reason, then, that God delivers them from this doubt, promising them that He will give such abundance in the sixth year as shall suffice for the two following ones. The phrase must be observed, that God would "command His blessing" in an especial manner, and beyond the usual course, so that the land should be twice or thrice more fertile. Hence is suggested to us no ordinary ground of confidence in asking for our daily bread. But this was a special promise, that food should not fail the Jews on account of the Sabbatical year; a manifestation of which God had already given in the desert, when supplied a double portion of manna to those who gathered it on the day before the Sabbath. Now-a-days this inconvenience is avoided by the industry of farmers, who so divide their acres that the land should never lie fallow altogether, but that one part should supply the deficiency of another. This distribution did not obtain with the Jews. Therefore God relieved them from the fear of famine down to the harvest of the eighth year; although He seems at the same time to accustom them to frugality, lest they should waste in intemperance and luxury what He afforded in sufficient abundance to last for two years. To this precept He alludes, when He declares by the Prophets that the land "enjoyed her Sabbaths," when it had vomited forth its inhabitants, (2 Chronicles 36:21;) for since they had polluted it by violating the Sabbath, so that it groaned as if under a heavy burden, He says that it shall rest for a long continuous period, so as to compensate for the labor of many years.

What shall we eat the seventh year? - A very natural question, which could only be laid at rest by the sovereign promise in the next verse:
I will Command my Blessing upon you in the sixth year, and it shall bring forth fruit for Three Years. See on Leviticus 25:2 (note).

And ye shall say, what shall ye eat the seventh year?.... Such as are of little faith, disbelieve the promise, and distrust the providence of God, and take thought for tomorrow, and indulge an anxiety of mind how they shall be provided with food in the sabbatical year ordered to be observed, in which there were to be no tillage of land, nor pruning of trees:
behold, we shall not sow; that being forbidden:
nor gather in our increase; neither the barley, nor the wheat, nor the grapes, nor olives, nor figs, into their houses and barns, to lay up for stores, as in other years; though they might go out and gather in for present use in common with others: now if any should put the above question, as it was very likely some would, in such a view of things, the answer to it follows.