Mishkat al-Masabih 1299
‘A’isha said:
I missed God’s Messengerone night and found him at al-Baqi‘. He said, “Were you afraid that God and His Messenger would act wrongly towards you?" I replied, “Messenger of God, I thought you had gone to one of your wives." He said, “On the middle night of Sha'ban God most high descends to the lowest heaven and forgives more sins than the hairs of the goats of Kalb." 

Tirmidhi and Ibn Majah transmitted it, and Razin added, “for those who deserve hell."Tirmidhi said, “I heard Muhammad (i.e., Bukhari) declare that this tradition is weak."
وَعَنْ عَائِشَةَ قَالَتْ: فَقَدْتُ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَيْلَةً فَإِذَا هُوَ بِالْبَقِيعِ فَقَالَ 
" أَكُنْتِ تَخَافِينَ أَنْ يَحِيفَ اللَّهُ عَلَيْكِ وَرَسُولُهُ؟ قُلْتُ: يَا رَسُولَ اللَّهِ إِنِّي ظَنَنْتُ أَنَّكَ أَتَيْتَ بَعْضَ نِسَائِكَ فَقَالَ: إِنَّ اللَّهَ تَعَالَى يَنْزِلُ لَيْلَةَ النِّصْفِ مِنْ شَعْبَانَ إِلَى السَّمَاءِ الدُّنْيَا فَيَغْفِرُ لِأَكْثَرَ مِنْ عَدَدِ شَعْرِ غَنَمِ كَلْبٍ " رَوَاهُ التِّرْمِذِيُّ وَابْنُ مَاجَهْ وَزَادَ رَزِينٌ: «مِمَّنِ اسْتَحَقَّ النَّارَ» وَقَالَ التِّرْمِذِيُّ: سَمِعْتُ مُحَمَّدًا يَعْنِي البُخَارِيّ يضعف هَذَا الحَدِيث