One verse

Srimad Bhagavatam 11.21.16

11.21.16

क्व‍‍चिद् गुणोऽपि दोष: स्याद् दोषोऽपि विधिना गुण: । गुणदोषार्थनियमस्तद्भ‍िदामेव बाधते ॥ १६ ॥

kvacid guṇo ’pi doṣaḥ syād doṣo ’pi vidhinā guṇaḥ guṇa-doṣārtha-niyamas tad-bhidām eva bādhate

kvacit
sometimes
guṇaḥ
piety
api
even
doṣaḥ
sin
syāt
becomes
doṣaḥ
sin
api
also
vidhinā
on the strength of Vedic injunction
guṇaḥ
piety
guṇa-doṣa
to piety and sin
artha
regarding
niyamaḥ
restrictive regulation
tat
of them
bhidām
the distinction
eva
actually
bādhate
undoes

Sometimes piety becomes sin, and sometimes what is ordinarily sin becomes piety on the strength of Vedic injunctions. Such special rules in effect eradicate the clear distinction between piety and sin.