Al-Adab Al-Mufrad, Hadith 377 ⓘ
Abu Hurayra said, "A man came to the Prophet, may Allah bless him and grant him peace, with a child which he began to embrace. The Prophet, may Allah bless him and grant him peace, said. 'Do you show mercy towards me?' 'Yes,' the man replied. He said, 'Allah is more merciful towards you than you are towards this child. He is the Most Merciful of the merciful.;:
حَدَّثَنَا عَبْدُ اللهِ بْنُ مُحَمَّدٍ، قَالَ: حَدَّثَنَا مَرْوَانُ، قَالَ: حَدَّثَنَا يَزِيدُ بْنُ كَيْسَانَ، عَنْ أَبِي حَازِمٍ، عَنْ أَبِي هُرَيْرَةَ قَالَ: أَتَى النَّبِيَّ صلى الله عليه وسلم رَجُلٌ وَمَعَهُ صَبِيٌّ، فَجَعَلَ يَضُمُّهُ إِلَيْهِ، فَقَالَ النَّبِيُّ صلى الله عليه وسلم: أَتَرْحَمُهُ؟ قَالَ: نَعَمْ، قَالَ: فَاللَّهُ أَرْحَمُ بِكَ مِنْكَ بِهِ، وَهُوَ أَرْحَمُ الرَّاحِمِينَ.
also referenced under: Book 20, Hadith 6 (In-Book) & Book 20, Hadith 377 (English)