Beautiful Hadith is about Respect for Someone Praying

Abul-Juhaim Abdullah bin Al-Harith RA said: The Messenger of Allah (sallallaahu ’alayhi wa sallam) said, "If the person who passes in front of a praying person, realizes the enormity of the sinfulness of this act, it will have been better for him to wait forty than to pass in front of him." (Bukhari and Muslim) (The narrator was not sure whether the Prophet (sallallaahu ’alayhi wa sallam) said forty days, months or years.)