Shiva Purana
शतमेकोत्तरं चैव ब्रह्मणोऽस्य गिरेस्तथा ॥ प्रक्रमणं विधायैवं शुद्धिस्ते च भविष्यति ॥ ५२ ॥
If you go round this mountain Brahmagiri hundred and one times you can attain purity.
english translation
zatamekottaraM caiva brahmaNo'sya girestathA ॥ prakramaNaM vidhAyaivaM zuddhiste ca bhaviSyati ॥ 52 ॥
hk transliteration by Sanscript