12 In Surahs Al-A`raf and Ash-Shu`araa', the snake has been called thu`ban (a large serpent) but here jaann, a small snake. The reason is that in physical size it was a serpent but in movement it was swift like a small snake. The same thing has been expressed by hayyatun tas `a (a running snake) in Ta Ha: 20.
13 That is, "In My Presence there is no danger of any harm to the Messenger. When I call someone into My Presence to appoint him to the high office of Prophethood, I Myself become responsible for his safety. Therefore, the Messenger should remain fearless and confident in every kind of unusual situation: it will never harm or hurt him in any way. "