Imam Ali b. Moosa al-Reza (a.s.) while describing the Imam said – There are certain signs designating the Imam. He is the most knowledgeable, the wisest, the most pious, the most patient, the bravest, the most generous, and the person who worships the most among the people. He was born circumcised. He is pure and clean. He sees the back as well as he sees the front. He has no shadow. When he falls out of his mother’s uterus onto the ground, he falls onto the palms of his hands and loudly declares the dual testimonial (that there is no god but Allah, and that Mohammad (s.a.w.a.) is Allah’s Messenger).
Oyoon Akhbaar al-Reza (a.s.) chap 19 trad 1