Skandapurana 6.3.228.6

6.3.228.6

śreṣṭhaṃ hi vihitaṃ prāhurdharmakarma yudhiṣṭhira .
taireva kārayettasmānnottamairnādhamairapi .. 228.6 ..

For religious acts performed by them are declared to be excellent, O Yudhiṣṭhira; / therefore, one should have them performed only by them, not by superiors nor by inferiors.