Narrated Al-Bara:
The last Sura that was revealed was Bara'a, and the last Verse that was revealed was: "They ask you for a legal verdict, Say: Allah's directs (thus) about those who leave no descendants or ascendants as heirs." (4.176)
USC-MSA web (English) reference: Vol. 6, Book 60, Hadith 129
Arabic reference: Book 65, Hadith 4605