Severe warning against passing in front of a praying person

 337. Busr bin Sa´id said that Zaid bin Khalid Al-Juhani sent him to Abu Juhaim to ask him what he had heard from the Messenger of Allah sallahu alayhi wa sallam about a person passing in front of a praying person. Abu Juhaim replied: The Messenger of Allah sallahu alayhi wa sallam said, ´´Were the person who passes in front of praying person to know the magnitude of his sin, he would have preferred to wait for 40 rather than to pass in front of him.´´ Abu An-Nadr said, ´´I do not remember exactly whether he said 40 days, months or years.´´