Eating Clay

Dawood bin al-Qassim saying, ‘Once, I went to Abu Ja'far (a.s) and I had three charters with me that were not signed with any name. I was uncertain whose ones they were and so I was distressed. He (Abu Ja'far) took one of them and said, ‘This is Ziyad bin Shabib’s’ and took the other and said, ‘This is of so-and-so’. I was astonished. He looked at me and smiled. I said, ‘May I die for you! I am interested in eating clay. Would you please pray Allah for me?’ He kept silent. Three days later, he said to me, ‘O Abu Hashim, Allah has taken eating clay away from you.’ After that, eating clay became too disgusted to me.’ ( Usul al-Kafi, p.569.)

Reference : The Life of Imam Muhammad Al-Jawad