«مَنْ لَمْ يَذَرِ الْمُخَابَرَةَ فَلْيُؤْذِنْ بِحَرْبٍ مِنَ اللهِ وَرَسُولِه»
(Whoever does not refrain from Mukhabarah, then let him receive a notice of war from Allah and His Messenger.)'' Al-Hakim also recorded this in his Mustadrak, and he said, â€It is Sahih according to the criteria of Muslim, and he did not record it.'' Mukhabarah (sharecropping), farming land in return for some of its produce, was prohibited. Muzabanah, trading fresh dates still on trees with dried dates already on the ground, was prohibited. Muhaqalah, which refers to trading produce not yet harvested, with crops already harvested, was also prohibited. These were prohibited to eradicate the possibility that Riba might be involved, for the quality and equity of such items are only known after they become dry. The subject of Riba is a difficult subject for many scholars. We should mention that the Leader of the Faithful, `Umar bin Al-Khattab, said, â€I wished that the Messenger of Allah had made three matters clearer for us, so that we could refer to his decision: the grandfather (regarding inheriting from his grandchildren), the Kalalah (those who leave neither descendants nor ascendants as heirs) and some types of Riba.'' `Umar was refering to the types of transactions where it is not clear whether they involve Riba or not. The Shari`ah supports the rule that for any matter that is unlawful, then the means to it are also unlafwful, because whatever results in the unlawful is unlawful, in the same way that whenever an obligation will not be complete except with something, then that something is itself an obligation. The Two Sahihs recorded that An-Nu`man bin Bashir said that he heard the Messenger of Allah say,