Bhagavad Gita 9.30

Even the most sinful, if he worships Me with his whole heart, shall be considered righteous, for he is treading the right path.

अपि चेत्सुदुराचारो भजते मामनन्यभाक्।
साधुरेव स मन्तव्यः सम्यग्व्यवसितो हि सः॥

api cetsudurācāro bhajate māmananyabhāk|
sādhureva sa mantavyaḥ samyagvyavasito hi saḥ||

English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).