Anandakanda 1.3.65

1.3.65

bhairavaṃ ca caturthyantaṃ karmāstraṃ ca daśāṃśakam /
vahnibījaṃ dīrghayuktaṃ karanyāsaṃ samācaret //

and "bhairavāya" ending in the dative case, and the weapon [mantra] of action, being one-tenth;
combined with the long vowels of the fire-seed, one should perform the imposition on the hands.