كتاب الفضائل
43
The Book of Virtues
(15)
Chapter: His Compassion Towards Children And His Humbleness, And The Virtue Of That
(15)
باب رَحْمَتِهِ صلى الله عليه وسلم الصِّبْيَانَ وَالْعِيَالَ وَتَوَاضُعِهِ وَفَضْلِ ذَلِكَ ‏‏
Sahih Muslim 2316

Anas b. Malik reported:

I have never seen anyone more kind to one's family than Allah's Messenger (ﷺ), and Ibrahim was sent to the suburb of Medina for suckling. He used to go there and we accompanied him. He entered the house, and it was filled with smoke as his foster-father was a bricksmith. He took him (his son Ibrihim) and kissed him and then came back. 'Amr said that when Ibrihim died. Allah's LMessenger (ﷺ) said: Ibrihim is my son and he dies as a suckling babe. He has now two foster-mothers who would complete his suckling period in Paradise.
حَدَّثَنَا زُهَيْرُ بْنُ حَرْبٍ، وَمُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، - وَاللَّفْظُ لِزُهَيْرٍ - قَالاَ حَدَّثَنَا إِسْمَاعِيلُ، - وَهُوَ ابْنُ عُلَيَّةَ - عَنْ أَيُّوبَ، عَنْ عَمْرِو بْنِ سَعِيدٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ مَا رَأَيْتُ أَحَدًا كَانَ أَرْحَمَ بِالْعِيَالِ مِنْ رَسُولِ اللَّهِ صلى الله عليه وسلم - قَالَ - كَانَ إِبْرَاهِيمُ مُسْتَرْضِعًا لَهُ فِي عَوَالِي الْمَدِينَةِ فَكَانَ يَنْطَلِقُ وَنَحْنُ مَعَهُ فَيَدْخُلُ الْبَيْتَ وَإِنَّهُ لَيُدَّخَنُ وَكَانَ ظِئْرُهُ قَيْنًا فَيَأْخُذُهُ فَيُقَبِّلُهُ ثُمَّ يَرْجِعُ ‏.‏ قَالَ عَمْرٌو فَلَمَّا تُوُفِّيَ إِبْرَاهِيمُ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ إِنَّ إِبْرَاهِيمَ ابْنِي وَإِنَّهُ مَاتَ فِي الثَّدْىِ وَإِنَّ لَهُ لَظِئْرَيْنِ تُكَمِّلاَنِ رَضَاعَهُ فِي الْجَنَّةِ ‏"‏ ‏.‏
Reference : Sahih Muslim 2316
In-book reference : Book 43, Hadith 84
USC-MSA web (English) reference : Book 30, Hadith 5734
  (deprecated numbering scheme)