Al-Walid bin Ibrahim bin Abd al-Rahman bin Awf narrates from his father, from his grandfather, who said: Umamah bint Abi al-As became gravely ill, so Zaynab (may Allah be pleased with her), the daughter of the Messenger of Allah (peace and blessings be upon him), sent a message to the Messenger of Allah (peace and blessings be upon him) saying that her daughter was gravely ill. He (peace and blessings be upon him) sent a message to his daughter: "What Allah has taken belongs to Allah, and what He has left also belongs to Allah." A second time the illness became severe, and she sent him a message that her daughter was gravely ill, so he (peace and blessings be upon him) sent his daughter the same message: "What Allah has taken belongs to Allah, and what He has left also belongs to Allah." Then it happened a third time, so the Prophet (peace and blessings be upon him) went to her himself. She brought the little girl out and presented her to him (peace and blessings be upon him), while her breath was rattling in her chest, and with the Prophet (peace and blessings be upon him) were some of his (peace and blessings be upon him) Companions. Tears began to flow from his (peace and blessings be upon him) eyes, until he (peace and blessings be upon him) took hold of his blessed beard. He (peace and blessings be upon him) perceived that the Companions were looking at him, so he (peace and blessings be upon him) said: "What is the matter with you, that you are looking?" They said: O Messenger of Allah, we saw that you were moved to tenderness. He (peace and blessings be upon him) said: "This is mercy, which Allah, the Mighty and Majestic, places wherever He wills, and tomorrow, on the Day of Resurrection, Allah will show mercy only to those of His servants who are merciful."
Hadith Referenceالمعجم الكبير للطبراني / العشرة / 282