Shivapurana 7.2.16.29

Śivapurāṇa (complete text) 7.2.16.29

ekāśanaṃ vā virataṃ snātaṃ prātaḥkṛtakriyam |
japantaṃ praṇavaṃ devaṃ dhyāyantaṃ kṛtamaṅgalam ||