Srimad Bhagavatam Canto 04, Chapter 19, Text 14

SB 4.19.14

tam tadrsakrtim viksya
mene dharmam saririnam
jatilam bhasmanacchannam
tasmai banam na muñcati
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
 
King Indra was fraudulently dressed as a sannyasi, having knotted his hair on his head and smeared ashes all over his body. Upon seeing such dress, the son of King Prthu considered Indra a religious man and pious sannyasi. Therefore he did not release his arrows.