Sa’ad ibn Abdillah from Ahmad ibn al-Hasan ibn Ali ibn Faddal from Amr ibn Said from Musaddiq ibn Sadaqah from Ammar ibn Musa from Abu Abdillah عليه السلام, peace be upon him. He said: I asked Imam al-Sadiq عليه السلام about a man who gestures in the obligatory and supererogatory prayers, when he does not find anything to prostrate upon and does not have a place in which he can perform prostration. Imam عليه السلام said: “If it is like that, then let him gesture throughout the entire prayer.”