Vṛṣṇivaṃśa–Anukīrtana (Enumeration of the Vṛṣṇi Lineage) — Questions on Viṣṇu’s Human Descent
यदि पास्यति भद्रं ते मत्तो मन्त्रमवाप्स्यसि / तथोक्तो देवदेवेन स शुक्रस्तु महातपाः
yadi pāsyati bhadraṃ te matto mantramavāpsyasi / tathokto devadevena sa śukrastu mahātapāḥ
If you can observe it—may auspiciousness be yours—then you shall obtain the mantra from me. Thus spoke the Deva of Devas; and Śukra, the great ascetic…