One verse

Bhagavad Gita 9.30

9.30

अपि चेत्सुदुराचारो भजते मामनन्यभाक् | साधुरेव स मन्तव्यः सम्यग्व्यवसितो हि सः ||९-३०||

api cetsudurācāro bhajate māmananyabhāk . sādhureva sa mantavyaḥ samyagvyavasito hi saḥ ||9-30||

api
even
cet
if
su-durācāraḥ
one committing the most abominable actions
bhajate
is engaged in devotional service
mām
unto Me
ananya-bhāk
without deviation
sādhuḥ
a saint
eva
certainly
saḥ
he
mantavyaḥ
is to be considered
samyak
completely
vyavasitaḥ
situated in determination
hi
certainly
saḥ
he

Even if one commits the most abominable action, if he is engaged in devotional service he is to be considered saintly because he is properly situated in his determination.