Musnad Ahmad 303:11

Yahya ibn Sa'id narrated to us, he said: Humayd—meaning al-Tawil—narrated to us, al-Hasan narrated to us, from Mutarrif, from his father, that a man said: "O Messenger of Allah, what is the share of the stray camels?" He said: "The stray of the Muslim is the burning of the Fire."