Sunan Abi Dawud 3334
Commercial Transactions (Kitab Al-Buyu)
Regarding The Abolition Of Riba
Narrated Sulaiman b. 'Amr: On the authority of his father: I heard the Messenger of Allah (ﷺ) say in the Farewell Pilgrimage: "Lo, all claims to usury of the pre-Islamic period have been abolished. You shall have your capital sums, deal not unjustly and you shall not be dealt with unjustly. Lo, all claims for blood-vengeance belonging to the pre-Islamic period have been abolished. The first of those murdered among us whose blood-vengeance I remit is al-Harith ibn AbdulMuttalib, who suckled among Banu Layth and killed by Hudhayl." He then said: O Allah, have I conveyed the message? They said: Yes, saying it three times. He then said: O Allah, be witness, saying it three times.