Indeed, Allah is more merciful to His servants than this is to her child

Some captives from the tribe of Hawāzin were brought to the Prophet (may Allah's peace and blessings be upon him). Among them was a woman searching for her child. Whenever she found a child, she would take him and breastfeed him due to the pain from milk accumulating in her breast. Eventually, she found her own son among the captives, so she took him, stuck him to her chest, and breastfed him.

The Prophet (may Allah's peace and blessings be upon him) then said to his Companions: Do you think this woman would throw her child into the fire? We said: No, she would never do this willingly. He said: Indeed, Allah is more merciful to His Muslim servants than this woman to her child.