Bhagavad Gita 9.30
अपि चेत्सुदुराचारो भजते मामनन्यभाक्। साधुरेव स मन्तव्यः सम्यग्व्यवसितो हि सः।।9.30।।
api cetsudurācāro bhajate māmananyabhāk| sādhureva sa mantavyaḥ samyagvyavasito hi saḥ||9.30||
api cetsuduracaro bhajate mamananyabhak sadhureva sa mantavyah samyagvyavasito hi sah9.30
Meaning
Even if a person of most vile conduct worships Krishna with exclusive devotion, they should be regarded as righteous, for they have rightly resolved. Past sins do not bar anyone from divine grace.
यदि कोई अतिशय दुराचारी भी अनन्यभाव से मेरा भक्त होकर मुझे भजता है, वह साधु ही मानने योग्य है, क्योंकि वह यथार्थ निश्चय वाला है।
This is verse 30 of 34 in Chapter 9 (Raja Vidya Raja Guhya Yoga) of the Bhagavad Gita.