Mahabharata 3.91.18

3.91.18

teṣāṃ yudhiṣṭhiro rājā pūjāṃ cakre yathāvidhi |
satkṛtāste mahābhāgā yudhiṣṭhiramathābruvan || 18 ||

"Thus addressed respectfully by them, the king--that bull amongst the sons of Pandu--surrounded by his heroic brothers headed by Bhima, with tears of joy in his eyes, said unto all those ascetics, 'Let it be so.' With the permission then of Lomasa, as also of his priest Dhaumya, that foremost of Pandu's sons with soul under complete control, resolved, along with his brothers and Drupada's daughter of faultless features, to set out. Just at this time, the blessed Vyasa, as also Parvata and Narada, all endued with high intelligence, came to Kamyaka for seeing the son of Pandu. Beholding them, king Yudhishthira worshipped them with due rites. And worshipped by the monarch thus, those blessed ones, addressing Yudhishthira, said, 'O Yudhishthira, O Bhima, and ye twins, banish all evil thoughts from your minds. Purify your hearts and then set out for the tirthas. The Brahmanas have said that the observance of regulations in respect of the body are called earthly vows, while efforts to purify the heart, so that it may be free from evil thoughts, are called spiritual vows. O king, the mind that is free from all evil thoughts is highly pure. Purifying yourselves, therefore, harbouring only friendly feelings for all, behold ye the tirthas. Observing earthly vows in respect of your bodies and purifying your minds by spiritual vows, obtain ye the fruits as recited, of pilgrimages."