It is narrated from Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) that he said: "Some captives were brought to the Messenger of Allah (peace and blessings be upon him). Among the captives was a woman running about anxiously (in search of her child). As soon as she found a child among the captives, she took hold of him, pressed him to her belly and began to nurse him. Then the Messenger of Allah (peace and blessings be upon him) asked: 'Do you think this woman would throw her child into the fire?' We said: 'By Allah, no, while she is able not to throw him (into it).' Then the Messenger of Allah (peace and blessings be upon him) said: 'Allah Almighty is more merciful to His servants than this woman is to her child.'"
No one narrated it from Zayd bin Aslam (may Allah have mercy on him) except Abu Ghassan (may Allah have mercy on him), and no one transmitted it from Abu Ghassan (may Allah have mercy on him) except Ibn Abi Maryam (may Allah have mercy on him); and this hadith is narrated from Sayyiduna Umar (may Allah be pleased with him) only with this chain.
Hadith Referenceالمعجم الأوسط / باب الألف / 3011
Hadith Takhrij«أخرجه البخاري فى «صحيحه» برقم: 5999، ومسلم فى «صحيحه» برقم: 2754، والبزار فى «مسنده» برقم: 287، والطبراني فى «الصغير» برقم: 272»