Mudgalapurana 4.30.14

4.30.14

sarvādau tadvrataṃ kāryaṃ catuḥpādapradaṃ nṛpa |
nityavannātra sandehaḥ sarvasiddhipradāyakam ||

Before everything else, that observance which bestows the four aims of life must be performed, O king, / as a regular duty, there is no doubt, granting all perfections.