Skandapurana 5.251.39

5.251.39

vinā yena śubhaṃ karma saṃpūrṇaṃ naiva jāyate..
pavitrāṇāṃ pavitraṃ yo maṅgalānāṃ ca maṅgalam..39..

without which no auspicious rite is complete; / which is the purest of the pure and the most auspicious of the auspicious;