Chapter 9 · verse 30 · gita.yoga.org

Bhagavad Gita 9.30

अपि चेत्सुदुराचारो भजते मामनन्यभाक्। साधुरेव स मन्तव्यः सम्यग्व्यवसितो हि सः

Even if the most sinful worships Me, with devotion to no one else, he should indeed be regarded as righteous, for he has rightly resolved.