Mahabharata 6.40.67

इदं ते नातपस्काय नाभक्ताय कदाचनन चाशुश्रूषवे वाच्यं न च मां योऽभ्यसूयति

idaṃ te nātapaskāya nābhaktāya kadācanana cāśuśrūṣave vācyaṃ na ca māṃ yo'bhyasūyati

Our plain-language meaning of this verse is waiting for scholar review.