riba al-fadl — many from Sahih Bukhari — are: Narrated Abu Said: We used to be given mixed dates (from the booty) and used to sell (barter) two Sas (of those dates) for one Sa (of good dates). The Prophet said (to us), "No (bartering of) two Sas for one Sa nor two Dirhams for one Dirham is permissible", (as that is a kind of usury). () Narrated 'Umar bin Al-Khattab: God's Apostle said, "The bartering of gold for silver is riba, (usury), except if it is from hand to hand and equal in amount, and wheat grain for wheat grain is usury except if it is from hand to hand and equal in amount, and dates for dates is usury except if it is from hand to hand and equal in amount, and barley for barley is usury except if it is from hand to hand and equal in amount". () Narrated Ibn 'Umar: Muhammad said, "The selling of wheat for wheat is riba (usury) except if it is handed from hand to hand and equal in amount. Similarly the selling of barley for barley, is Riba except if it is from hand to hand and equal in amount, and dates for dates is usury except if it is from hand to hand and equal in amount. () Narrated AbuHurayrah: Muhammad said: If anyone makes two transactions combined in one bargain, he should have the lesser of the two or it will involve usury. (Sunan Abu Daud) Raqiub Zaman notes that when riba is described in hadith literature, it is "in the context of sales" (where riba al-fadl might apply), with "no mention of loan (qard) or debt (dayan)", (where riba an-nasiya might apply). However, there are various contradictions and discrepancies in ahadith on riba al-fadl. Both M.O. Farooq and M.A. Khan quote a well-known hadith by Usama bin Zayd (in Sahih al-Bukhari) making a rather categorical statement that "there is no riba except in nasi'ah (delay)". Farooq cites another from Sahih Muslim "There is no riba in hand-to-hand [spot] transactions." Farooq quotes another scholar (Iqbal Ahmad Khan Suhail) who believes the two ahadith "demolish the self-invented castle of riba al-fadl". M.A. Khan also believes the hadith indicate that riba in a spot exchange is "ruled out". According to scholar Farhad Nomani, ahadith citing Ibn `Abbas, a companion of Muhammad, "report that there is no riba except in deferment...