Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
suyuti:17a
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السيوطي:١٧a

"آخِرُ سُورةٍ نزلتْ كاملةً بَراءَةُ".  

[ن] النسائي

See similar narrations below:

Collected by Muslim, Suyūṭī
muslim:1618dAbū Kurayb > Yaḥyá / Ibn Ādam > ʿAmmār / Ibn Ruzayq > Abū Isḥāq > al-Barāʾ Bimithlih Ghayr

Aba Ishaq reported this hadith on the authority of al-Bara' (Allah be pleased with him) with a slight variation of words, viz. the last sura that was revealed complete.  

مسلم:١٦١٨dحَدَّثَنَا أَبُو كُرَيْبٍ حَدَّثَنَا يَحْيَى يَعْنِي ابْنَ آدَمَ حَدَّثَنَا عَمَّارٌ وَهُوَ ابْنُ رُزَيْقٍ عَنْ أَبِي إِسْحَاقَ عَنِ الْبَرَاءِ بِمِثْلِهِ غَيْرَ

أَنَّهُ قَالَ آخِرُ سُورَةٍ أُنْزِلَتْ كَامِلَةً