Is the prohibition of Riba (usury) comprehensive, encompassing both Riba al-Fadl (excess in exchange of like items) and Riba an-Nasiah (excess due to delay)?
Chapter on Riba (Usury) and Exchange (Sarf)
Al-Mughni
Book of Sales
Primary text
Both Riba al-Fadl and Riba an-Nasiah are categorically prohibited based on the consensus of the scholars. The sound position, supported by the majority, is established by the Hadith of Abu Sa'id al-Khudri where the Prophet forbade selling gold for gold except measure for measure without excess, and likewise silver, and forbade selling what is absent for what is present (cash). Another explicit evidence is the Hadith of 'Ubadah ibn as-Samit specifying six items (gold, silver, dates, wheat, salt, barley) where exchange must be measure for measure when of the same kind, and allowing exchange of unlike items hand-to-hand regardless of the manner of exchange. This Hadith confirms Riba al-Fadl in these specified categories.
Supporting text
A difference of opinion existed among some Companions, including Ibn Abbas, Usamah ibn Zayd, Zayd ibn Arqam, and Ibn az-Zubayr, who initially held that usury was restricted only to delay (Riba an-Nasiah), based on the Prophet's statement: "There is no usury except in delay." However, the text states that Ibn Abbas later retracted this view and returned to the opinion of the majority.