مشكوة المصابيح
Mishkat al-Masabih
كتاب الدعوات
The Book of Supplications
(تِسْعٌ وَتِسْعُونَ رَحْمَةً مَحْفُوظَةٌ لِيَوْمِ القِيَامَةِ)
(Ninety-nine mercies are reserved for the Day of Judgment)
Hadith 2366
وَفِي رِوَايَةٍ لِمُسْلِمٍ عَنْ سَلْمَانَ نَحْوُهُ وَفِي آخِرِهِ قَالَ: «فَإِذَا كَانَ يَوْمُ الْقِيَامَةِ أَكْمَلَهَا بِهَذِهِ الرَّحْمَة»
A version by Muslim from Salman has something similar, at the end of which he said, “When the day of resurrection comes He will complete them with this one.”
