Sahih al-Bukhari Book 78, Hadith 30
Some Sabi (i.e. war prisoners, children and woman only) were brought before the Prophet (ﷺ) and behold,
a woman amongst them was milking her breasts to feed and whenever she found a child amongst the
captives, she took it over her chest and nursed it (she had lost her child but later she found him) the
Prophet said to us, "Do you think that this lady can throw her son in the fire?" We replied, "No, if she
has the power not to throw it (in the fire)." The Prophet (ﷺ) then said, "Allah is more merciful to His
slaves than this lady to her son."
A bedouin came to the Prophet (ﷺ) and said, "You (people) kiss the boys! We don't kiss them." The Prophet said, "I cannot put mercy in your heart after Allah has taken it away from it."
I heard Allah's Messenger (ﷺ) saying, Allah divided Mercy into one hundred parts. He kept ninety nine parts with Him and sent down one part to the earth, and because of that, its one single part, His Creations are merciful to each other, so that even the mare lifts up its hoofs away from its baby animal, lest it should trample on it."