The vision begins:
“In the name of Allah, the Abundantly Merciful, the Intensely Merciful. I saw myself as if standing on a seashore and the sea’s tide was ebbing, but I was in prostration praying without rising from my prostration. I was prostrating on the mud and the ground had small holes in it, and in the holes there was water remaining from the sea. And during one of my prostrations, my hair was of medium length and when I prostrated, my hair went into a hole filled with water. When I lifted my head I found that a crab was clinging to a lock of my hair near my forehead, but I removed it with one blow, then it fell, and it was of a very small size. I prostrated again and when I lifted my head…