Musnad Ahmad 32:1523

Muhammad ibn Abd Allah al-Ansari narrated to us, Humayd narrated to us, from Anas, who said: There was a young boy on the side of the road, and the Prophet, peace and blessings of Allah be upon him, passed by with some of his companions. When the boy’s mother saw the people, she feared that her son would be trampled, so she rushed and picked him up, saying: "My son, my son!" The people said: "O Messenger of Allah, this woman would not throw her son into the fire." The Prophet, peace and blessings of Allah be upon him, said: "No, and Allah does not throw His beloved into the fire."