Sayyiduna Ammar bin Yasir (may Allah be pleased with him) says: I and Sayyiduna Ali (may Allah be pleased with him) were companions in the expedition of Dhi al-Ashira. When the Messenger of Allah (peace and blessings be upon him) camped there and stayed, we saw some people from the tribe of Banu Mudlij working in their spring among the date palms. Sayyiduna Ali said to me: Abu al-Yaqzan! What do you think, should we go to them and see how they work? So we went to them and watched their work for a while, then sleep overcame us. I and Sayyiduna Ali went into a cluster of date palms and lay down in the soil and slept. By Allah! It was the Messenger of Allah (peace and blessings be upon him) who woke us up by moving us with his foot, and we were covered in soil. When the Messenger of Allah (peace and blessings be upon him) saw the soil on Sayyiduna Ali, he said: O Abu Turab! (meaning, O man of the soil). Then he said: Shall I not inform you of the two most wretched men? We said: O Messenger of Allah! Why not. He (peace and blessings be upon him) said: The red one of Thamud, who hamstrung the she-camel, and the man who (O Ali!) will strike your head until your (beard) is soaked with blood.