Mishkat al-Masabih 1722
Anas said:
We went in with God’s messenger to visit Abu Saif the smith who was foster-father of Ibrahim (The Prophet’s son who died in infancy), and God’s messenger took Ibrahim, kissed him and smelt him. We went in to visit him later when Ibrahim was giving up his soul, and tears began to fall from God’s messenger's eyes, whereupon ‘Abd ar-Rahman b. ‘Auf said to him, “You too, messenger of God?” He replied, “Ibn ‘Auf, it is compassion,” then shed more tears and said, “The eye weeps and the heart grieves, but we say only what our Lord is pleased with, and we are grieved over being separated from you, Ibrahim.”

(Bukhari and Muslim.)
عَنْ أَنَسٍ قَالَ: دَخَلْنَا مَعَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَلَى أَبِي سَيْفٍ الْقَيْنِ وَكَانَ ظِئْرًا لِإِبْرَاهِيمَ فَأَخَذَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِبْرَاهِيمَ فَقَبَّلَهُ وَشَمَّهُ ثُمَّ دَخَلْنَا عَلَيْهِ بَعْدَ ذَلِكَ وَإِبْرَاهِيمُ يَجُودُ بِنَفْسِهِ فَجَعَلَتْ عَيْنَا رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ تَذْرِفَانِ. فَقَالَ لَهُ عَبْدُ الرَّحْمَنِ بْنُ عَوْفٍ: وَأَنْتَ يَا رَسُولَ اللَّهِ؟ فَقَالَ: 
" يَا ابْنَ عَوْفٍ إِنَّهَا رَحْمَةٌ ثُمَّ أَتْبَعَهَا بِأُخْرَى فَقَالَ: إِنَّ الْعَيْنَ تَدْمَعُ وَالْقَلْبَ يَحْزَنُ وَلَا نَقُولُ إِلَّا مَا يُرْضِي رَبَّنَا وَإِنَّا بِفِرَاقِك يَا إِبْرَاهِيم لَمَحْزُونُونَ "