Musnad Abu Ya'la al-Mawsili 129:30

Ubayd Allah ibn Umar narrated to us, Yazid ibn Zuray narrated to us, Humayd narrated to us, from Anas, who said: The Prophet, peace and blessings of Allah be upon him, passed by a group of his companions, and there was a young boy on the side of the road. His mother feared that he would be trampled, so she rushed, saying, "My son! My son!" and she took him. The people said, "O Messenger of Allah, this woman would not throw her son into the fire." He said, "And Allah would not throw His beloved into the fire."