Narrated Ibn `Abbas:
The last Verse (in the Qur'an) revealed to the Prophet (ﷺ) was the Verse dealing with usury (i.e. Riba). (ES)
USC-MSA web (English) reference: Vol. 6, Book 60, Hadith 67 (ES)
Arabic reference (ES): Book 65, Hadith 4544 (ES)