Shiva Purana
भूतरंध्रदिशश्चैव ध्वजश्च वरवर्णिनि ॥ वामचारगतौ नादः प्रमाणं कालवेदिनः॥ ४२॥
O fair lady, Bhūtarandhra (?) the quarters and the banner are the sounds in the left hand practices.
english translation
bhUtaraMdhradizazcaiva dhvajazca varavarNini ॥ vAmacAragatau nAdaH pramANaM kAlavedinaH॥ 42॥
hk transliteration by Sanscript