It is narrated from Sayyiduna Zayd bin Thabit (may Allah be pleased with him) that he said: May Allah Almighty forgive Sayyiduna Rafi' (may Allah be pleased with him); by Allah, I know the hadith better than him. Two men of the Ansar came to him (peace and blessings be upon him), and they had been fighting. He (peace and blessings be upon him) said: "If this is your situation, then do not rent out the fields." Sayyiduna Rafi' (may Allah be pleased with him) heard these words: 'Do not rent out the farmland.'
The Shaykh said: Sayyiduna Zayd bin Thabit and Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) both objected, and Allah knows best, to the prohibition of renting out farmland being unrestricted. What Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) meant by what was not forbidden is renting it for gold, silver and something in which there is no uncertainty (gharar). Some of the narrators from Sayyiduna Rafi' (may Allah be pleased with him) have specified the kinds on which the prohibition fell, and explained the reason for the prohibition, which is the fear of the crop being destroyed; for that is uncertainty, which renders the contract invalid. And if what Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) meant by what was not forbidden is renting it for part of its produce, then we have narrated (the prohibition) from those who heard him (peace and blessings be upon him) forbid it, so the ruling goes with them, not with him. We have also narrated from Sayyiduna Zayd bin Thabit (may Allah be pleased with him) what agrees with the narration of Sayyiduna Rafi' bin Khadij (may Allah be pleased with him) and others; this is proof that what he objected to is something other than what he affirmed, and Allah knows best. Some scholars have taken the hadiths of prohibition to refer to muzara'ah with invalid conditions, such as stipulating to the cultivator the channels and the streams, that the crop along these streams is for the owner alone. Likewise the condition of qusarah: the grain that remains in the ear after threshing is called qusarra. Likewise the condition of what a small stream irrigates, such as channels and the like, as they said. These conditions, and those resembling them, the owner stipulated exclusively for himself, besides the half, quarter or third. So they hold that the Prophet (peace and blessings be upon him) forbade muzara'ah because of these conditions. When the shares are known, such as a half, a quarter or a third, the invalid conditions are absent and muzara'ah becomes permissible. This is the position of Imam Ahmad bin Hanbal (may Allah have mercy on him), and it was adopted by Abu Ubayd, Muhammad bin Ishaq bin Khuzaymah and other people of hadith, and by Imam Abu Yusuf (may Allah have mercy on him) and Muhammad bin al-Hasan, who are among the people of opinion (ashab al-ra'y). The hadiths of the Prophet (peace and blessings be upon him) concerning (his dealing with) the people of Khaybar for half of the yield, which he set on their fruit and crops so that grain would come from them, are evidence in this issue. Imam Ahmad bin Hanbal (may Allah have mercy on him) declared the hadith of Rafi' bin Khadij weak and said that there is much variation in it, referring to what we have pointed out: that there is variation in its text and chain.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المزارعة / 11737