صَحِيحُ مُسْلِمٍ
Sahih Muslim 760 b
The Book of Prayer - Travellers
Encouragement to pray qiyam during Ramadan, which is Tarawih
حَدَّثَنِي مُحَمَّدُ بْنُ رَافِعٍ، حَدَّثَنَا شَبَابَةُ، حَدَّثَنِي وَرْقَاءُ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ مَنْ يَقُمْ لَيْلَةَ الْقَدْرِ فَيُوَافِقُهَا - أُرَاهُ قَالَ - إِيمَانًا وَاحْتِسَابًا غُفِرَ لَهُ .
Abu Huraira reported Allah's Messenger (ﷺ) as saying: He who prayed on the Lailat-ul-Qadr (the Majestic Night) knowing that it is (the same night). I (believe) that he (the Prophet (ﷺ) also) said: (He who does) it with faith and seeking reward (from Allah), his sins would be forgiven.
Sahih Muslim, 760 bSahihصحيح