Shiva Purana
इशानाद्यानि सूक्ष्माणि ब्रह्माण्येकाक्षराणि तु ॥ मंत्रे नमश्शिवायेति संस्थितानि यथाक्रमम् ॥ मंत्रे षडक्षरे सूक्ष्मे पञ्चब्रह्मतनुः शिवः ॥ ९ ॥
The subtle forms of the Vedas, beginning with the north-east, are composed of one syllable. These are arranged in order in the mantra 'Obeisances to Lord Śiva' In the subtle six-syllabled mantra Lord Shiva is embodied in the five Brahmans.
english translation
izAnAdyAni sUkSmANi brahmANyekAkSarANi tu ॥ maMtre namazzivAyeti saMsthitAni yathAkramam ॥ maMtre SaDakSare sUkSme paJcabrahmatanuH zivaH ॥ 9 ॥
hk transliteration by Sanscript