Husayn bin Abdullah bin Dumayrah narrates from his father, from his grandfather (may Allah be pleased with him), that the Messenger of Allah (peace and blessings be upon him) passed by the mother of Dumayrah while she was weeping. He (peace and blessings be upon him) asked: "What makes you weep? Are you hungry, or are you without clothing?" She said: O Messenger of Allah! I have been separated from my son. The Messenger of Allah (peace and blessings be upon him) said: "A mother and her child are not to be separated." Then he (peace and blessings be upon him) sent for the man who had Dumayrah, called him, and bought him from him for a young she-camel.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18311