Dīkṣā-bhedaḥ (Types of Initiation) — Lalitopākhyāna: Hayagrīva–Agastya Dialogue
शुक्लपक्षे शुभदिने विधाय शुचिमानसम् / जिह्वास्यमलशुद्धिं च कृत्वा स्नात्वा यथाविधि
śuklapakṣe śubhadine vidhāya śucimānasam / jihvāsyamalaśuddhiṃ ca kṛtvā snātvā yathāvidhi
In the bright fortnight (śukla-pakṣa), on an auspicious day, make the mind pure; cleanse the impurities of tongue and mouth, and bathe according to the prescribed rule.