R. Yehudah b. Bava says: "And I shall give grass in your field to your beasts": Within the (Sabbath) bound (i.e., two thousand ells). R. Shimon b. Yochai says: "And I shall give grass in your field to your beasts": You will cut (the grass) and throw it before your beast all the days of the rainy season, and leave it to itself thirty days before the harvest season, and it will work without lacking for corn.
Variantly: "And I shall give grass in your field to your field": This is flax. And thus is it written (Psalms 104:14) He makes flax sprout for the beast, and grass for the labor of man."