Sahih Al Bukhari Hadith Number 1303

Narrated Anas bin Malik: We went with Allah’s Messenger (peace be upon him) (peace be upon him) to the blacksmith Abu Saif, and he was the husband of the wet-nurse of Ibrahim (the son of the Prophet). Allah’s Messenger (peace be upon him) took Ibrahim and kissed him and smelled him and later we entered Abu Saif’s house and at that time Ibrahim was in his last breaths, and the eyes of Allah’s Messenger (peace be upon him) (peace be upon him) started shedding tears. `Abdur Rahman bin `Auf said, “O Allah’s Apostle, even you are weeping!” He said, “O Ibn `Auf, this is mercy.” Then he wept more and said, “The eyes are shedding tears and the heart is grieved, and we will not say except what pleases our Lord, O Ibrahim ! Indeed we are grieved by your separation.”