The last verse revealed (in the Holy Quran) is that pertaining to Kalala, and the last sura revealed is Sura al-Bara'at.
Sahih Muslim Book 23, Hadith 14
← Previous Hadith " They ask thee for a religious verdict; say: Allah gives you a religious verdict about Kalala (the person who has neither parents nor children)" (iv 177).

Sahih Muslim Book 23, Hadith 13 Next Hadith → The last complete sura revealed (in the Holy Qur'an) is Sura Tauba (i e. al-Bara'at, ix.), and the last verse revealed is that pertaining to Kalala.

Sahih Muslim Book 23, Hadith 15