It was narrated from Abu Hurairah that the Prophet (ﷺ) said:
“Allah has one hundred (degrees of) mercy, of which He has shared one between all of creation, by virtue of which you show mercy and compassion towards one another and the wild animals show compassion towards their young. And He has kept back ninety-nine (degrees of) mercy by virtue of which He will show mercy to His slaves on the Day of Resurrection.”
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ، أَنْبَأَنَا عَبْدُ الْمَلِكِ، عَنْ عَطَاءٍ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ ـ صلى الله عليه وسلم ـ قَالَ ‏ "‏ إِنَّ لِلَّهِ مِائَةَ رَحْمَةٍ قَسَمَ مِنْهَا رَحْمَةً بَيْنَ جَمِيعِ الْخَلاَئِقِ فَبِهَا يَتَرَاحَمُونَ وَبِهَا يَتَعَاطَفُونَ وَبِهَا تَعْطِفُ الْوَحْشُ عَلَى أَوْلاَدِهَا وَأَخَّرَ تِسْعَةً وَتِسْعِينَ رَحْمَةً يَرْحَمُ بِهَا عِبَادَهُ يَوْمَ الْقِيَامَةِ ‏"‏ ‏.‏
GradeSahih (Darussalam)
English reference : Vol. 5, Book 37, Hadith 4293
Arabic reference : Book 37, Hadith 4434