Here is the Sanskrit anuvad, Hindi anuvad, and English translation of Karma Yoga Chapter 3, Verse 3.13.
Sanskrit
यज्ञशिष्टाशिनः सन्तो मुच्यन्ते सर्वकिल्बिषैः । भुञ्जते ते त्वघं पापा ये पचन्त्यात्मकारणात् ॥ ३.१३ ॥
Hindi
यज्ञसे बचे हुए अन्नको खानेवाले श्रेष्ठ पुरुष सब पापोंसे मुक्त हो जाते हैं और जो पापीलोग अपना शरीर पोषण करनेके लिये ही अन्न पकाते – हैं, वे तो पापको ही खाते हैं|
English
The Blessed Lord Krishna said:People who eat food after offering it for sacrifice are considered pious, pure, and are freed from all sins. People who prepare food only for themselves commit sins and are impure.