al-Sunan al-Kubrá, Nasāʾī
السنن الكبرى للنسائي
Largest of the three collections of aḥādīth by Imām al-Nasāʾī. The al-Sunan al-Sughrá (The Small Collection of Sunnah), also known as Sunan al-Nasāʾī, is already part of the Six Books. Full name: al-Sunan al-Kubrá (السنن الكبرى) (The Large Collection of Sunnah). Sources: Shamela Book# 8361 for the Arabic text. The English translation is being added by myself and other contributors.
Random ḥadīth in Nasāʾī's Kubrá
The Messenger of Allah ﷺ used to recite al-Musabbihat before going to sleep, and say: They contain a verse which is better than a thousand verses. (Using translation from Abū Dāʾūd 5057)
أَنَّ النَّبِيَّ ﷺ كَانَ يَقْرَأُ الْمُسَبِّحَاتِ قَبْلَ أَنْ يَرْقُدَ وَيَقُولُ «إِنَّ فِيهَا أَيَّةً أَفْضَلَ مِنْ أَلْفِ آيَةٍ»