What is the source of "VishvAdhiko Rudro Maharshi" (विश्वाधिको रुद्रो महर्षिः)?

Question

I'm finding Source for "VishvAdhiko Rudro Maharshi" Mantra.

विश्वाधिको रुद्रो महर्षिः

VishvAdhiko Rudro Maharshi

Answer 1

Taittariya Aranyaka of Krishna Yajurveda (10.12) contains this mantra:

यो देवानां प्रथमं पुरस्ताद्विश्वाधिको रुद्रो महर्षिः ।
हिरण्यगर्भं पश्यत जायमानꣳ स नो देवः शुभयास्मृत्या संयुनक्तु ॥ (Taittariya Aranyaka 10.12)

This mantra is also quoted in Shwetashwatara Upanishad 3.4 with slight variation:

यो देवानां प्रभवश्चोद्भवश्च विश्वाधिपो रुद्रो महर्षिः ।
हिरण्यगर्भं जनयामास पूर्वंस नो बुद्ध्या शुभया संयुनक्तु ॥ ४॥

He, the omniscient Rudra, the creator of the gods and the bestower of their powers, the support of the universe, He who, in the beginning, gave birth to Hiranyagarbha-may He endow us with clear intellect!

Similarly, in Bhasma Jabala Upanishad also Lord Shiva speaks:

विश्वं भूतं भुवनं चित्रं बहुधा जातं जायमानं च यत्सर्वस्य सोमोऽहमेव जनिता विश्वाधिको रुद्रो महर्षिः । (Bhasma Jabala Upanishad)

I, Soma, am the creator of various worlds, past, present, and future. I, Rudra the great seer transcending all, see the Brahma and other created beings.