At the time of Hijrat ,the prophet recited the following ayats from Sura Yasin (36),so that the enemies COULD NOT SEE even when he escaped in fron of their eyes from Mecca
V 8...Inna Ja'alna fe A' Na ke him Agh la lan fa heya ila al azkaan fa hum mukmahun
Verily we have put on their necks iron collars reaching upto their chins so that their heads are raised up.
V 9... Wa ja alna mim bayne Aide him saddawn min khal fe him saddan fa agshaina hum fa hum la yubseroon
And we have put a barrier before them & a barrier behind them,and We have covered them up,so that they cannot see