Ikrimah, the freed slave of Ibn Abbas, narrated that:

Ibn Abbas said: “We were with the Messenger of Allah (S) when Ali bin Abi Talib came to him, and he said: ‘May my father and mother be ransomed for you! This Quran has suddenly left my heart, and I do not find myself capable of it.’ So the Messenger of Allah (A) said to him: ‘O Abul-Hasan! Should I not teach you words that Allah shall benefit you with, and benefit whomever you teach, and they will make whatever you have learned in your chest firm?’ He said: ‘Of course, O Messenger of Allah (S), so teach me.’ He said: ‘When it is the night of (before) Friday, then if you are able to stand in the last third of the night, then verily it is a witnessed hour, and supplication is answered in it. And my brother Ya’qub (AS) did say to his sons: I shall seek forgiveness for you from my Lord. He said: “Until the night of Friday comes.” So if you are not able, then stand in the middle of it, and if you are not able then stand in the first of it. And pray four Rak’ah. Recite Fatihatul-Kitab (the Opening of the Book) and Surat Ya-Sin in the first Rakah, and Fatihatul-Kitab and Ha-Min Ad-Dukhan in the second Rakah, and Fatihatul-Kitab and Alif Lam Mim Tanzil As-Sajdah in the third Rakah, and Fatihatul-Kitab and Tabarak Al-Mufassal in the fourth Rakah. So when you have finished with the Tasha-hud, then praise Allah and mention Allah’s greatness in an excellent manner, and send Salat upon me - and be excellent in it - and upon the rest of the Prophet. And seek forgiveness for the believing women, and for your brothers who have preceded you in faith. Then say in the end of that: “O Allah, have mercy on me by abandonment of sins forever, so long as You keep me remaining. And have mercy on me from taking upon myself what does not concern me, and provide me good sight for what will make You pleased with me. O Allah, Originator of the heavens and the earth, Possessor of glory, and generosity, and honor that is not exceeded. I ask you, O Allah, O Rahman, by Your glory and the light of Your Face, to make my heart constant in remembering Your Book as You taught me, and grant me that I recite it in the manner that will make You pleased with me. O Allah, Originator of the heavens and the earth, Possessor of glory, and generosity, and honor that is not exceeded. I ask you, O Allah, O Rahman, by Your glory and the light of Your Face, to enlighten me sight with Your Book, and make my tongue free with it, and to relieve my heart with it, and to expand my chest with it, and to wash my body with it. For indeed, none aids me upon the truth other than You, and none gives it except You, and there is no might or power except by Allah, the High, the Magnificent. (Allahummarhamni Bitarkil-Ma’asi Abadan Ma Abqaitani, Warhamni An Atakallafa Ma La Ya’nini, Warzuqni Husnan-Nazari Fi Ma Yurdika Anni. Allahumma Badi’as Samawati Wal-Ardi Dhal-Jalali Wal-Ikrami Wal-Izzatil-lat La Turamu As’aluka Ya Allahu Ya Rahmanu Bi-Jalalika Wa Nuri Wajhika An Tulzima Qalbi Hifza Kitabika Kama Allamtani Warzuqni An Atluwahu Alan-Nahwil-ladhi Yurdika Anni. Allahumma Badi’as Samawati Wal Ardi Dhal-Jalali Wal-Ikrami Wal Izzati-llahi La Turamu As’aluka Ya Allahu, Ya Rahmanu Bi-Jalalika Wa Nuri Wajhika An Tunawwira Bi-Kitabika Basari, Wa An Tufarrija Bihi Sadri, Wa An Taghsila Bihi Badani, Fa’innahu La Yu’inuni Alal-Haqqi Ghairuka Wa La Yu’tihi Illa Anta Wa La Hawla Wa La Quwwata Illa Billahil-Alil-Azim).” O Abul-Hasan! So do this three Fridays, or five, or seven, you will be answered - by the will of Allah - by the One Who sent me with the Truth, it has not failed a believer once.’”
Abdullah bin abbas said: “So, by Allah, ali did not wait but five or seven until [Ali] came to the Messenger of Allah in a gathering similar to that and said: ‘O Messenger of Allah, indeed I was [a man] in the time that passed, who used to not take except four Ayat or about that much, so when I would recite them to myself they would suddenly depart from me, and today I learn forty Ayat or about that much, and when I recite them to myself, then it is as if the Book of Allah is before my eyes. I used to hear a Hadith and when I would repeat it, it would suddenly depart from me, and today I hear Ahadith, and when I report them, I do not err in a single letter.’ So the Messenger of Allah said at that point: ‘A believer, by the Lord of the Ka’bah, O Abul-Hasan.’”

حَدَّثَنَا أَحْمَدُ بْنُ الْحَسَنِ، حَدَّثَنَا سُلَيْمَانُ بْنُ عَبْدِ الرَّحْمَنِ الدِّمَشْقِيُّ، حَدَّثَنَا الْوَلِيدُ بْنُ مُسْلِمٍ، حَدَّثَنَا ابْنُ جُرَيْجٍ، عَنْ عَطَاءِ بْنِ أَبِي رَبَاحٍ، وَعِكْرِمَةَ، مَوْلَى ابْنِ عَبَّاسٍ عَنِ ابْنِ عَبَّاسٍ، أَنَّهُ قَالَ بَيْنَمَا نَحْنُ عِنْدَ رَسُولِ اللَّهِ ﷺ إِذْ جَاءَهُ عَلِيُّ بْنُ أَبِي طَالِبٍ فَقَالَ بِأَبِي أَنْتَ وَأُمِّي تَفَلَّتَ هَذَا الْقُرْآنُ مِنْ صَدْرِي فَمَا أَجِدُنِي أَقْدِرُ عَلَيْهِ . فَقَالَ لَهُ رَسُولُ اللَّهِ ﷺ " يَا أَبَا الْحَسَنِ أَفَلاَ أُعَلِّمُكَ كَلِمَاتٍ يَنْفَعُكَ اللَّهُ بِهِنَّ وَيَنْفَعُ بِهِنَّ مَنْ عَلَّمْتَهُ وَيُثَبِّتُ مَا تَعَلَّمْتَ فِي صَدْرِكَ " . قَالَ أَجَلْ يَا رَسُولَ اللَّهِ فَعَلِّمْنِي . قَالَ " إِذَا كَانَ لَيْلَةُ الْجُمُعَةِ فَإِنِ اسْتَطَعْتَ أَنْ تَقُومَ فِي ثُلُثِ اللَّيْلِ الآخِرِ فَإِنَّهَا سَاعَةٌ مَشْهُودَةٌ وَالدُّعَاءُ فِيهَا مُسْتَجَابٌ وَقَدْ قَالَ أَخِي يَعْقُوبُ لِبَنِيهِ : (سوْفَ أَسْتَغْفِرُ لَكُمْ رَبِّي ) يَقُولُ حَتَّى تَأْتِيَ لَيْلَةُ الْجُمُعَةِ فَإِنْ لَمْ تَسْتَطِعْ فَقُمْ فِي وَسَطِهَا فَإِنْ لَمْ تَسْتَطِعْ فَقُمْ فِي أَوَّلِهَا فَصَلِّ أَرْبَعَ رَكَعَاتٍ تَقْرَأُ فِي الرَّكْعَةِ الأُولَى بِفَاتِحَةِ الْكِتَابِ وَسُورَةِ يس وَفِي الرَّكْعَةِ الثَّانِيَةِ بِفَاتِحَةِ الْكِتَابِ وَ( حم ) الدُّخَانَ وَفِي الرَّكْعَةِ الثَّالِثَةِ بِفَاتِحَةِ الْكِتَابِ وَالم تَنْزِيلُ السَّجْدَةَ وَفِي الرَّكْعَةِ الرَّابِعَةِ بِفَاتِحَةِ الْكِتَابِ وَتَبَارَكَ الْمُفَصَّلَ فَإِذَا فَرَغْتَ مِنَ التَّشَهُّدِ فَاحْمَدِ اللَّهَ وَأَحْسِنِ الثَّنَاءَ عَلَى اللَّهِ وَصَلِّ عَلَىَّ وَأَحْسِنْ وَعَلَى سَائِرِ النَّبِيِّينَ وَاسْتَغْفِرْ لِلْمُؤْمِنِينَ وَالْمُؤْمِنَاتِ وَلإِخْوَانِكَ الَّذِينَ سَبَقُوكَ بِالإِيمَانِ ثُمَّ قُلْ فِي آخِرِ ذَلِكَ اللَّهُمَّ ارْحَمْنِي بِتَرْكِ الْمَعَاصِي أَبَدًا مَا أَبْقَيْتَنِي وَارْحَمْنِي أَنْ أَتَكَلَّفَ مَا لاَ يَعْنِينِي وَارْزُقْنِي حُسْنَ النَّظَرِ فِيمَا يُرْضِيكَ عَنِّي اللَّهُمَّ بَدِيعَ السَّمَوَاتِ وَالأَرْضِ ذَا الْجَلاَلِ وَالإِكْرَامِ وَالْعِزَّةِ الَّتِي لاَ تُرَامُ أَسْأَلُكَ يَا اللَّهُ يَا رَحْمَنُ بِجَلاَلِكَ وَنُورِ وَجْهِكَ أَنْ تُلْزِمَ قَلْبِي حِفْظَ كِتَابِكَ كَمَا عَلَّمْتَنِي وَارْزُقْنِي أَنْ أَتْلُوَهُ عَلَى النَّحْوِ الَّذِي يُرْضِيكَ عَنِّي اللَّهُمَّ بَدِيعَ السَّمَوَاتِ وَالأَرْضِ ذَا الْجَلاَلِ وَالإِكْرَامِ وَالْعِزَّةِ الَّتِي لاَ تُرَامُ أَسْأَلُكَ يَا اللَّهُ يَا رَحْمَنُ بِجَلاَلِكَ وَنُورِ وَجْهِكَ أَنْ تُنَوِّرَ بِكِتَابِكَ بَصَرِي وَأَنْ تُطْلِقَ بِهِ لِسَانِي وَأَنْ تُفَرِّجَ بِهِ عَنْ قَلْبِي وَأَنْ تَشْرَحَ بِهِ صَدْرِي وَأَنْ تَغْسِلَ بِهِ بَدَنِي لأَنَّهُ لاَ يُعِينُنِي عَلَى الْحَقِّ غَيْرُكَ وَلاَ يُؤْتِيهِ إِلاَّ أَنْتَ وَلاَ حَوْلَ وَلاَ قُوَّةَ إِلاَّ بِاللَّهِ الْعَلِيِّ الْعَظِيمِ يَا أَبَا الْحَسَنِ تَفْعَلُ ذَلِكَ ثَلاَثَ جُمَعٍ أَوْ خَمْسَ أَوْ سَبْعَ تُجَابُ بِإِذْنِ اللَّهِ وَالَّذِي بَعَثَنِي بِالْحَقِّ مَا أَخْطَأَ مُؤْمِنًا قَطُّ " . قَالَ عَبْدُ اللَّهِ بْنُ عَبَّاسٍ فَوَاللَّهِ مَا لَبِثَ عَلِيٌّ إِلاَّ خَمْسًا أَوْ سَبْعًا حَتَّى جَاءَ عَلِيٌّ رَسُولَ اللَّهِ ﷺ فِي مِثْلِ ذَلِكَ الْمَجْلِسِ فَقَالَ يَا رَسُولَ اللَّهِ إِنِّي كُنْتُ فِيمَا خَلاَ لاَ آخُذُ إِلاَّ أَرْبَعَ آيَاتٍ أَوْ نَحْوَهُنَّ وَإِذَا قَرَأْتُهُنَّ عَلَى نَفْسِي تَفَلَّتْنَ وَأَنَا أَتَعَلَّمُ الْيَوْمَ أَرْبَعِينَ آيَةً أَوْ نَحْوَهَا وَإِذَا قَرَأْتُهَا عَلَى نَفْسِي فَكَأَنَّمَا كِتَابُ اللَّهِ بَيْنَ عَيْنَىَّ وَلَقَدْ كُنْتُ أَسْمَعُ الْحَدِيثَ فَإِذَا رَدَّدْتُهُ تَفَلَّتَ وَأَنَا الْيَوْمَ أَسْمَعُ الأَحَادِيثَ فَإِذَا تَحَدَّثْتُ بِهَا لَمْ أَخْرِمْ مِنْهَا حَرْفًا . فَقَالَ لَهُ رَسُولُ اللَّهِ ﷺ عِنْدَ ذَلِكَ " مُؤْمِنٌ وَرَبِّ الْكَعْبَةِ يَا أَبَا الْحَسَنِ " .

قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ غَرِيبٌ لاَ نَعْرِفُهُ إِلاَّ مِنْ حَدِيثِ الْوَلِيدِ بْنِ مُسْلِمٍ .