Shiva Purana
वाचःस्रवा मुनिस्साक्षात्तथा सूक्ष्मायणिः शुचिः ॥ तृणबिंदुर्मुनिः कृष्णः शक्तिः शाक्तेय उत्तरः ॥ ४७ ॥
The sage is directly flowing with speech and is subtle and pure The sage Trinabindu is Krishna and Shakti is the northern Shakteya.
english translation
vAcaHsravA munissAkSAttathA sUkSmAyaNiH zuciH ॥ tRNabiMdurmuniH kRSNaH zaktiH zAkteya uttaraH ॥ 47 ॥
hk transliteration by Sanscript