Sahih Bukhari Volume 5, Book 59, Hadith Number 650.
Narrated By Al-Bara : The last Sura which was revealed in full was Baraa (i.e. Sura-at-Tauba), and the last Sura (i.e. part of a Sura) which was revealed was the last Verses of Sura-an-Nisa’: “They ask you for a legal decision. Say: Allah directs (thus) About those who have No descendants or ascendants As heirs.” (4.177)