One verse

Srimad Bhagavatam 11.7.45

11.7.45

तेजस्वी तपसा दीप्तो दुर्धर्षोदरभाजन: । सर्वभक्ष्योऽपि युक्तात्मा नादत्ते मलमग्निवत् ॥ ४५ ॥

tejasvī tapasā dīpto durdharṣodara-bhājanaḥ sarva-bhakṣyo ’pi yuktātmā nādatte malam agni-vat

tejasvī
brilliantly luminous
tapasā
by his austerity
dīptaḥ
glowing
durdharṣa
unshakable
udara-bhājanaḥ
eating only that needed by his stomach
sarva
everything
bhakṣyaḥ
eating
api
even though
yukta-ātmā
one who is fixed in spiritual life
na ādatte
does not assume
malam
contamination
agni-vat
like the fire

Saintly persons become powerful by execution of austerities. Their consciousness is unshakable because they do not try to enjoy anything within the material world. Such naturally liberated sages accept foodstuffs that are offered to them by destiny, and if by chance they happen to eat contaminated food, they are not affected, just like fire, which burns up contaminated substances that are offered to it.