Sunan Abi Dawud

Narrated Abu Juhaim : The Messenger of Allah(ﷺ) as saying: ""If one who passes in front of a man who is praying knew the responsibility he incurs, he would prefer to stand still for forty. . . rather than pass in front of him. Abu al-Nadr said: I do not know whether he said forty days, or months, or years."" Abu Dawud: Sufyan al-Thawri said: If a man passes proudly in front of me while I am praying, I shall stop him, and if a weak man passes, I shall not stop him