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
"Messenger of Allah ﷺ went out to inform the people about the (date of the) night of decree (Al-Qadr) but there happened a quarrel between two Muslim men. The Prophet ﷺ said, "I came out to inform you about (the date of) the night of Al-Qadr, but as so and so and so and so quarrelled, its knowledge was taken away (I forgot it) and maybe it was better for you. Now look for it in the 7th, the 9th and the 5th (of the last 10 nights of the month of Ramadan)." (Using translation from Bukhārī 49)
أَنَّ النَّبِيَّ ﷺ خَرَجَ لِيُخْبِرَنَا بِلَيْلَةِ الْقَدْرِ فَتَلَاحَى رَجُلَانِ مِنَ الْمُسْلِمِينَ فَقَالَ «إِنِّي خَرَجْتُ لِأُخْبِرَكَمْ بِلَيْلَةِ الْقَدْرِ وَإِنَّهُ تَلَاحَى فُلَانٌ وَفُلَانٌ فَرُفِعَتْ وَعَسَى أَنْ يَكُونَ خَيْرًا لَكُمْ فَالْتَمِسُوهَا فِي التِّسْعِ وَالسَّبْعِ وَالْخَمْسِ»