Mahabharata 5.40.26

5.40.26

brahmakṣatraṃ vaiśyavarṇaṃ ca śūdraḥ krameṇaitānnyāyataḥ pūjayānaḥ |
tuṣṭeṣveteṣvavyatho dagdhapāpastyaktvā dehaṃ svargasukhāni bhuṅkte || 26 ||

Having properly worshipped Brahmanas, Kshatriyas, and Vaisayas in due order, and having burnt his sins, by gratifying them, and then peacefully casting off his body, the Sudra enjoyeth the bliss of heaven. The duties of the four orders are thus set forth before thee. Listen now to the reason of my speech as I discourse it. Yudhishthira, the son of Pandu, is falling off from the duties of the Kshatriya order. Place him, therefore, O king, in a position to discharge the duties of kings.'