Shivapurana 2.5.47.22

Śivapurāṇa (complete text) 2.5.47.22

yaḥ pītvā kaṇadhūmaṃ vai sahasraṃ śaradāṃ purā |
tvayā prāptā varā vidyā tasyāḥ kālo'yamāgataḥ ||