In the name of Allah, the Gracious, the Merciful
Al-Nawawi records in his book Riyad al-Salihin:
Allah Almighty said:
إِنَّا أَنزَلْنَاهُ فِي لَيْلَةِ الْقَدْرِ وَمَا أَدْرَاكَ مَا لَيْلَةُ الْقَدْرِ لَيْلَةُ الْقَدْرِ خَيْرٌ مِّنْ أَلْفِ شَهْرٍ تَنَزَّلُ الْمَلَائِكَةُ وَالرُّوحُ فِيهَا بِإِذْنِ رَبِّهِم مِّن كُلِّ أَمْرٍ سَلَامٌ هِيَ حَتَّىٰ مَطْلَعِ الْفَجْرِ
Verily, We sent the Quran down during the Night of Decree. And what will make you know what is the Night of Decree? The Night of Decree is better than a thousand months. The angels and the Spirit descend therein by permission of their Lord for every matter. Peace it is, until the appearance of dawn.
Surat al-Qadr 97:1-5
And Allah said:
إِنَّا أَنزَلْنَاهُ فِي لَيْلَةٍ مُّبَارَكَةٍ إِنَّا كُنَّا مُنذِرِينَ فِيهَا يُفْرَقُ كُلُّ أَمْرٍ حَكِيمٍ أَمْرًا مِّنْ عِندِنَا
Verily, We sent it down during a blessed night. Verily, We send warning. On that night every wise command is made distinct, a command from Us.
Surat al-Dukhān 44:3-6
Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said:
مَنْ صَامَ رَمَضَانَ إِيمَانًا وَاحْتِسَابًا غُفِرَ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ وَمَنْ قَامَ لَيْلَةَ الْقَدْرِ إِيمَانًا وَاحْتِسَابًا غُفِرَ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ
Whoever fasts the month of Ramadan due to faith and seeking reward, his previous sins will be forgiven. Whoever stands in prayer during the Night of Decree due to faith and seeking reward, his previous sins will be forgiven.
Source: Ṣaḥīḥ al-Bukhārī 1901, Grade: Sahih
Ibn Umar reported: The Messenger of Allah, peace and blessings be upon him, said:
الْتَمِسُوهَا فِي الْعَشْرِ الْأَوَاخِرِ يَعْنِي لَيْلَةَ الْقَدْرِ فَإِنْ ضَعُفَ أَحَدُكُمْ أَوْ عَجَزَ فَلَا يُغْلَبَنَّ عَلَى السَّبْعِ الْبَوَاقِي
Look for the Night of Decree in the last ten nights of Ramadan. If one of you is weak or unable, then do not be overcome during the remaining seven nights.
Source: Ṣaḥīḥ Muslim 1165, Grade: Sahih
Aisha reported: The Messenger of Allah, peace and blessings be upon him, would seek seclusion in the mosque during the last ten nights of Ramadan and he would say:
تَحَرَّوْا لَيْلَةَ الْقَدْرِ فِي الْعَشْرِ الْأَوَاخِرِ مِنْ رَمَضَانَ
Search for the Night of Decree during the last ten nights of Ramadan.
Source: Ṣaḥīḥ al-Bukhārī 2020, Grade: Sahih
In another narration, the Prophet said:
تَحَرَّوْا لَيْلَةَ الْقَدْرِ فِي الْوِتْرِ مِنْ الْعَشْرِ الْأَوَاخِرِ مِنْ رَمَضَانَ
Search for the Night of Decree in the odd nights among the last ten nights of Ramadan.
Source: Ṣaḥīḥ al-Bukhārī 2017, Grade: Muttafaqun Alayhi
Aisha, may Allah be pleased with her, said:
كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا دَخَلَ الْعَشْرُ شَدَّ مِئْزَرَهُ وَأَحْيَا لَيْلَهُ وَأَيْقَظَ أَهْلَهُ
When the last ten days of Ramadan arrived, the Prophet, peace and blessings be upon him, would tighten his belt, spend the night in worship, and awaken his family.
Source: Ṣaḥīḥ al-Bukhārī 2024, Grade: Muttafaqun Alayhi
In another narration, Aisha said:
كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَجْتَهِدُ فِي الْعَشْرِ الْأَوَاخِرِ مَا لَا يَجْتَهِدُ فِي غَيْرِهِ
The Prophet would exert himself in worship during the last ten nights of Ramadan more so than any other time.
Source: Ṣaḥīḥ Muslim 1175, Grade: Sahih
Aisha reported: I said, “O Messenger of Allah, I see that you know which night is the Night of Decree. What should I say during it?” The Messenger of Allah, peace and blessings be upon him, said:
قُولِي اللَّهُمَّ إِنَّكَ عُفُوٌّ تُحِبُّ الْعَفْوَ فَاعْفُ عَنِّي
Say: O Allah, You are pardoning. You love to forgive, so forgive me.
Source: Sunan al-Tirmidhī 3513, Grade: Sahih
Success comes from Allah, and Allah knows best.