Sahih Muslim Book 37, Hadith Number 6635.
Chapter : The mercy of Allah predominates his wrath.
‘Umar b. Khattab reported that there were brought some prisoners to Allah’s Messenger (may peace be upon him) amongst whom there was also a woman, who was searching (for someone) and when she found a child amongst the prisoners, she took hold of it, pressed it against her chest and provided it suck. Thereupon Allah’s Messenger (may peace be upon him) said: Do you think this woman would ever afford to throw her child in the Fire? We said: By Allah, so far as it lies in her power, she would never throw the child in Fire.’ Thereupon Allah’s Messenger (may peace be upon him) said: Allah is more kind to His servants than this woman is to her child.