Hadithcore
Sahih Muslim, 1618 c
sahih

Abu Ishaq said that he heard al-Bara' b. 'Azib (Allah be pleased with him) say:

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.

حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ الْحَنْظَلِيُّ، أَخْبَرَنَا عِيسَى، - وَهُوَ ابْنُ يُونُسَ - حَدَّثَنَا زَكَرِيَّاءُ، عَنْ أَبِي إِسْحَاقَ، عَنِ الْبَرَاءِ، أَنَّ آخِرَ، سُورَةٍ أُنْزِلَتْ تَامَّةً سُورَةُ التَّوْبَةِ وَأَنَّ آخِرَ آيَةٍ أُنْزِلَتْ آيَةُ الْكَلاَلَةِ ‏.‏

References2 variants
In-Book Reference
Book 23, Hadith 15
USC-MSA web (English) reference
Book 11, Hadith 3941 (deprecated numbering scheme)
Related hadiths1
Compare isnād across 1 related chains →