Srimad-Bhagavatam: Canto 4 - Chapter 1 - Verse 14
Sanskrit:
तं तादृशाकृतिं वीक्ष्य मेने धर्मं शरीरिणम् ।जटिलं भस्मनाच्छन्नं तस्मै बाणं न मुञ्चति ॥ १४ ॥
ITRANS:
taṁ tādṛśākṛtiṁ vīkṣyamene dharmaṁ śarīriṇamjaṭilaṁ bhasmanācchannaṁtasmai bāṇaṁ na muñcati
Translation:
King Indra was fraudulently dressed as a sannyāsī, having knotted his hair on his head and smeared ashes all over his body. Upon seeing such dress, the son of King Pṛthu considered Indra a religious man and pious sannyāsī. Therefore he did not release his arrows.