Sahih al-Bukhari, Volume 6, Book 60, Hadith 67 (USC-MSA) ⓘ
Narrated Ibn `Abbas: The last Verse (in the Qur'an) revealed to the Prophet was the Verse dealing with usury (i.e. Riba).
حَدَّثَنَا قَبِيصَةُ بْنُ عُقْبَةَ، حَدَّثَنَا سُفْيَانُ، عَنْ عَاصِمٍ، عَنِ الشَّعْبِيِّ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ قَالَ آخِرُ آيَةٍ نَزَلَتْ عَلَى النَّبِيِّ صلى الله عليه وسلم آيَةُ الرِّبَا.
also referenced under: Book 65, Hadith 4544 (In-Book) & Hadith 4544 (DarusSalam)