Sayyiduna Usama bin Zaid (may Allah be pleased with him) says: The daughter of the Messenger of Allah (peace and blessings be upon him) (Sayyida Zainab, may Allah be pleased with her) sent word to the Prophet (peace and blessings be upon him) that her son or daughter was in the throes of death, so please come to us. The Prophet (peace and blessings be upon him) sent greetings to his daughter in reply and said: Whatever Allah takes and whatever He gives, everything belongs to Him, and with Him everything has an appointed time, so she should be patient and hope for reward. But this time, the daughter swore an oath and called the Prophet (peace and blessings be upon him) again. So the Prophet (peace and blessings be upon him) got up and we also went along with him. The child was placed in the lap of the Prophet (peace and blessings be upon him), and at that time his soul was departing. Among the people present was Sayyiduna Sa’d bin Ubadah (may Allah be pleased with him), and I think Sayyiduna Ubayy (may Allah be pleased with him) was also there. The eyes of the Messenger of Allah (peace and blessings be upon him) overflowed with tears. Sayyiduna Sa’d (may Allah be pleased with him) said: O Messenger of Allah! What is this? The Prophet (peace and blessings be upon him) said: This is mercy, which Allah places in the hearts of whichever of His servants He wills, and Allah is merciful to His merciful servants.