Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
suyuti:673-103b

[Machine] My beloved, the Messenger of Allah ﷺ , came to me on the night of the middle of the month of Sha'ban. He went to his bed, then got up and poured water over himself, then hurried out. I followed in his footsteps and found him prostrating and saying in his prostration: "My blackness and my illusions have prostrated to you, and my heart believes in you. These are my hands, I have wronged myself, so forgive my sins. For no one forgives the great sin except you, O Great Lord. I returned to my place, and it wasn't long before he returned to me. I said: By my mother and father, O Messenger of Allah, tonight I have seen from you what I have never seen before. He said: O Humayra, this night is the night of the middle of Sha'ban. On this night, Allah frees a hundred thousand people from Hellfire, as many as the hair of the goats of the tribe of Kalb. And on this night, Allah looks upon His creation and says: Is there anyone seeking forgiveness so that I may forgive him? Is there anyone repenting so that I may accept his repentance? And on this night, every wise matter is decreed.  

السيوطي:٦٧٣-١٠٣b

"أَتَانِي حَبِيبِي رَسُولُ اللهِ ﷺ لَيْلَةَ النِّصْفِ مِنْ شَهْرِ شَعْبَانَ، فَأَوَى إِلَى فِرَاشِهِ، ثُمَّ قَامَ فَأَفَاضَ عَلَيْه المَاء، ثُمَّ خَرَجَ مُسْرِعًا، فَخَرَجْتُ فِي أَثَرِهِ، فَإِذَا هُوَ سَاجِدٌ فِي (*) وَيقُولُ فِي سُجُودِهِ: سَجَدَ لَكَ سَوَادِي وَخَيَالِي، وَآمَنَ بِكَ فُؤَادِي، هَذِهِ يَدَايَ، أَنَا جَنَيْتُ عَلَى نَفْسِي، فَاغْفِرْ لِي ذُنُوبِي؛ فَإِنَّهُ لَا يَغْفِرُ الذَّنْبَ العَظِيمَ غَيْرُكَ، يَا رَبِّ العَظِيم، فَرَجَعْتُ إِلَى مَكَانِي، فَمَا لَبِثَ أَنْ رَجَعَ إِليَّ، فَقُلْتُ: بِأَبِي أَنْتَ وَأُمِّي يَا رَسُولَ اللهِ لَقَدْ رَأَيْتُ مِنْكَ فِي هَذِهِ اللَّيْلَةِ مَا لَمْ أَرَ مِنْكَ قَبْلَهَا، قَالَ: يَا حُمَيْرَاءُ! هَذِهِ اللَّيْلَةُ لَيْلَةُ النِّصْفِ مِنْ شَهْرِ شَعْبَانَ، للهِ مِنْهَا مِائِةُ أَلَفِ عَتِيقٍ مِنَ النَّارِ، وَبِعَدَدِ شَعَرِ مِعْزَى كَلْبٍ، وَهِيَ الَّتِي يَطَّلِعُ اللهُ - تَعَالَى - فِيهَا عَلَى خَلْقِهِ فيقول: خَلْقَهُ، أَمَا مِنْ تَائِبٍ فَأَتُوبَ عَلَيْهِ؟ أَمَا مِنْ مُسْتَغْفِرٍ فَأَغْفِرَ لَهُ؟ وَفِيهَا يُفْرَقُ كُلُّ أمْرٍ حَكِيمٍ".  

ابن شاهين في الترغيب