Chapter on the Manner of Prayer, Its Description and What is Obligatory and Recommended

Ahmad ibn Muhammad from Ahmad ibn Ishaq from Yasir the servant, who said: Abu Al-Hasan عليه السلام, passed by me while I was praying on the Tabari mat, and I had placed something upon it to prostrate on, so Imam عليه السلام said to me: “Why do you not prostrate upon it? Is it not from what the earth has produced?”