Shiva Purana
वर्णाः पदानि मंत्राश्च तत्त्वान्यपि सहाधिपैः ॥ ब्रह्मांडधारका रुद्रा रुद्राश्चान्ये सशक्तिकाः ॥ १६२ ॥
The varṇas, the steps, the mantras and the elements are also described with the rulers. The Rudras who hold the universe and other Rudras with their powers.
english translation
varNAH padAni maMtrAzca tattvAnyapi sahAdhipaiH ॥ brahmAMDadhArakA rudrA rudrAzcAnye sazaktikAH ॥ 162 ॥
hk transliteration by Sanscript