"O Messenger of Allah, what do you think I should say in my supplication, if I come upon Laylatul-Qadr?" He said: "Say: 'Allahumma innaka 'afuwwun tuhibbul-'afwa, fa'fu 'anni (O Allah, You are Forgiving and love forgiveness, so forgive me).'" (Using translation from Ibn Mājah 3850)
قُلْتُ يَا رَسُولَ اللهِ إِنَّ عَلِمْتُ أَيُّ لَيْلَةٍ لَيْلَةُ الْقَدْرِ مَا أَقُولُ فِيهَا؟ قَالَ قَوْلِي «اللهُمَّ إِنَّكَ عَفُوٌّ تُحِبُّ الْعَفْوَ فَاعْفُ عَنِّي»