Moses
Exodus 23:11ESV·traditional attribution

but the seventh year you shall let it rest and lie fallow, that the poor of your people may eat; and what they leave the beasts of the field may eat. You shall do likewise with your vineyard, and with your olive orchard.

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. The institution of the sabbatical year, Exo 23:10, Exo 23:11. Every seventh year the land was to rest; they must not plough nor sow it at the beginning of the year, and then they could not expect any great harvest at the end of the year: but what the earth did produce of itself should be eaten from hand to mouth, and not laid up.

Commenting on Exodus 23:10-19

John Gill Reformed Baptist @doctorgill

Six days thou shalt do thy work,.... That is, they might do what work they would on the six days of the week: and on the seventh day thou shall rest; from all the work and labour done on other days, and give up themselves to religious exercises: that thine ox and thine ass may rest; and so every other beast, as horses, camels, &c.

Adam Clarke Methodist @methodicalclarke

The seventh year thou shalt let it rest - As, every seventh day was a Sabbath day, so every seventh year was to be a Sabbath year. The reasons for this ordinance Calmet gives thus: - "1. To maintain as far as possible an equality of condition among the people, in setting the slaves at liberty, and in permitting all, as children of one family...