Naradapurana 1.63.9

Nāradapurāṇa 1.63.9

tantraṃ bhāgavataṃ viprā guruśiṣyaprayojakam /
dīkṣaṇaṃ prātarādyaṃ ca kṛtyaṃ syādyattaducyatām //