The last verse revealed to the Prophet ﷺ was the verse on usury.
آخر آية نزلت على النبي ﷺ آية الربا.
Bukhari narrated it in the tafsir (4544) from Qabisa bin Uqba, who said, Sufyan narrated to us, from Asim, from Shaybi, from Ibn Abbas, and he related it.The verse about riba is His saying, Most High, "O you who believe, fear Allah and give up what remains of riba, if you are believers." [Baqarah 2:278]