Mishkat al-Masabih #1636

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.)