Better be dust

'Abdullah Ben 'Amr (Radia Allahu anhu) said:

"It would be better for a person to be turned to dust than to deliberately walk in front of a person who is praying"

 SOURCE: Ibn ‘Abd Al-Barr, Al-Tamhîd. 
                   Graded sahîh by Shaykh Al-Albânî in Sahîh Al-Targhîbi wa Al-Tarhîb Vol. 1 Pag 135