Narrated Al-Bara:
The last Verse that was revealed was: 'They ask you for a legal verdict: Say: Allah directs (thus) about Al-Kalalah (those who leave no descendants or ascendants as heirs).' And the last Sura which was revealed was Baraatun (9) .
USC-MSA web (English) reference: Vol. 6, Book 60, Hadith 177
Arabic reference: Book 65, Hadith 4654