من لا يحضره الفقيه, volume 3, page 251

Hadith.3909 - Muhammad bin Sahl narrated from his father, who said: I asked Abu Al-Hasan (as) about a man whose farmer plants saffron for him and guarantees to pay him a specified amount of dirhams for each measured jarib of land. Sometimes the yield is less, causing a loss, and sometimes it is more, yielding a profit. Imam (as) said: "There is no harm in it if they mutually agree."

Translation: Bab Ul Qaim Publications·Thaqalayn link·The Arabic above is the original.

Hadith.3910 - It is narrated from Ali bin Yaqtin, who said: I asked Abu Al-Hasan (as) about a man who rents a house or a boat from another man for a year, more, or less. Imam (as) said: "The lease is binding until the agreed-upon time. As for the payment of the rent, it is up to the owner, if he wishes, he may take it, and if he wishes, he may waive it."

Translation: Bab Ul Qaim Publications·Thaqalayn link·The Arabic above is the original.

Hadith.3911 - Ali the goldsmith asked Abu Abdillah (as): "I take on work and then hire young workers to assist me, giving them two-thirds of the earnings. Is this permissible?" Imam (as) said: "This is not permissible unless you work alongside them." I said: "What if I melt the gold for them?" Imam (as) said: "That is considered work, so there is no harm in it."

Translation: Bab Ul Qaim Publications·Thaqalayn link·The Arabic above is the original.