Zaid bin Khalid Al-Juhni sent a message to Abu Juhaim asking him what he had heard from Allah's Messenger about passing in front of a person who was performing Salat. Abu Juhaim said :that Allah's Messenger said: "If the one who passed in front of the person performing Salat knew what he was doing, then for him to stop (and wait for forty) would be better for him than to pass in front of him

English translation · Jami' at-Tirmidhi