Jami` at-Tirmidhi, Book 48, Hadith 144 (In-Book) ⓘ
Aishah narrated: “I said: ‘O Messenger of Allah, what is your view if I know when the Night of Al-Qadr is, then what should I say in it?” He said: ‘Say: “O Allah, indeed You are Pardoning, [Generous,] You love pardon, so pardon me (Allāhumma innaka `Afuwwun [Karīmun], tuḥibbul-`afwa fa`fu `annī).’”
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا جَعْفَرُ بْنُ سُلَيْمَانَ الضُّبَعِيُّ، عَنْ كَهْمَسِ بْنِ الْحَسَنِ، عَنْ عَبْدِ اللَّهِ بْنِ بُرَيْدَةَ، عَنْ عَائِشَةَ، قَالَتْ قُلْتُ يَا رَسُولَ اللَّهِ أَرَأَيْتَ إِنْ عَلِمْتُ أَىُّ لَيْلَةٍ لَيْلَةُ الْقَدْرِ مَا أَقُولُ فِيهَا قَالَ " قُولِي اللَّهُمَّ إِنَّكَ عَفُوٌّ كَرِيمٌ تُحِبُّ الْعَفْوَ فَاعْفُ عَنِّي " . قَالَ هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ .
also referenced under: Hadith 3513 (Reference) & Volume 6, Book 45, Hadith 3513 (DarusSalam)