[Machine] The Messenger of Allah ﷺ said: "Whoever stands in prayer on Laylat al-Qadr (the Night of Decree) with faith and seeking reward, will have all his previous sins forgiven." Affan said: "And Aban narrated a similar hadith in this chain of narration."
وَقَالَ رَسُولُ اللهِ ﷺ مَنْ قَامَ لَيْلَةَ الْقَدْرِ إِيمَانًا وَاحْتِسَابًا فَإِنَّهُ يُغْفَرُ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ قَالَ عَفَّانُ وَحَدَّثَنَا أَبَانُ فِي هَذَا الْإِسْنَادِ مِثْلَهُ
"The Messenger of Allah said: 'Whoever spends the nights of Ramadan in prayer (Qiyam) out of faith and in the hope of reward, he will be forgiven his previous sins." ' (Using translation from Nasāʾī 2197)
وَقَالَ رَسُولُ اللهِ ﷺ مَنْ قَامَ رَمَضَانَ إِيمَانًا وَاحْتِسَابًا فَإِنَّهُ يُغْفَرُ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ
Messenger of Allah ﷺ said, "Whoever establishes the prayers on the night of Qadr out of sincere faith and hoping to attain Allah's rewards (not to show off) then all his past sins will be forgiven." (Using translation from Bukhārī 35)
وَقَالَ رَسُولُ اللهِ ﷺ مَنْ قَامَ لَيْلَةَ الْقَدْرِ إِيمَانًا وَاحْتِسَابًا فَإِنَّهُ يُغْفَرُ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ