Sunan al-Nasāʾī
سُنَنُ النَّسَائِي
One of the nine major ḥadīth collections of the Sunnah which is smaller of the two authored by Nasāʿī. Full name: al-Sunan al-Sughrá (السنن الصغرى) (The Minor Book of Sunnah). Sources: sunnah.com for the Arabic text and English translation. The English translation has been improved by myself and other contributors.
Random ḥadīth in Nasāʾī
"The Prophet said to me: 'If you swear an oath, and you see something that is better, then do that which is better and offer expiation for your oath.'"
لِي النَّبِيُّ ﷺ إِذَا آلَيْتَ عَلَى يَمِينٍ فَرَأَيْتَ غَيْرَهَا خَيْرًا مِنْهَا فَأْتِ الَّذِي هُوَ خَيْرٌ وَكَفِّرْ عَنْ يَمِينِكَ