Abul Ḥasan (Imam Riďā (a.s.)) sent me some clothes that were wrapped up, in the middle of which there was some clay. I asked the person who had brought the clothes about this clay. He said, “It is the clay of the grave of Ḥusain (a.s.). He (Imam Riďā (a.s.)) does not send clothes or anything else to anyone without putting some of this clay within it and he says, ‘It is protection with the permission of Allāh.”