[If] he sold him a field, and he gave him part of the money, and he said to him: “Whenever you wish, bring the money and take yours,” it is prohibited.  [If] he lent him on [the security of] his field, and said to him: “If you do not pay me within three years, it is mine,” it is his. And so was Baisos the son of Zonin wont to do, with the consent of the Sages.

A storekeeper may not be set up for half the profit, nor may money be given with which to buy produce at half profit, unless he gives him his wages as a laborer.  Hens may not be set to brood at half [profit], nor may calves or foals be assessed at half [profit], unless he gives him the wage of his toil and his feed. But calves or foals may be accepted for half profit and raised until they reach a third of their growth; and a donkey, until it can bear [a burden].

A cow or a donkey or anything that works and eats may be assessed at half profit. [In] a place where they are accustomed to divide the offspring immediately, they divide [them]; [in] a place where they are accustomed to raise [them], they must raise [them]. Rabban Shimon ben Gamliel says: A calf may be assessed with its mother, and a foal with its mother. One may in-crease the rent of his field, and he need not fear that it is interest.

Fixed-value property may not be accepted from a Jew, because it is interest. But fixed-value property may be accepted from gentiles, and we may borrow from them and lend them with interest. And so it is with a resident alien.  A Jew may lend out a gentile’s money with the knowledge of the gentile, but not with the knowledge of a Jew.