Sanskrit

एवम् एव दुर्निशायां कृष्णपक्षागमे चिरम्।
तैमिरम् भावयन् रूपम् भैरवं रूपम् एष्यति॥ ८७॥

Transliteration

evam eva durniśāyāṁ kṛṣṇapakṣāgame ciram |
taimiram bhāvayan rūpam bhairavaṁ rūpam eṣyati || 87 ||

Translation

Like this, one should ever contemplate on the terrible darkness of night during the dark fortnight of the moon, if he desires to attain the form of bhairava.