Shiva Purana
अस्य श्रीसौरमंत्रस्य देवभाग ऋषिस्ततः ॥ छन्दो गायत्रमित्युक्तं देवस्सूर्यो महेश्वरः ॥ ९॥
The sage of this Śrī Sauramantra is Devabhaga. The chant is called Gayatra and the god is the sun and the great Lord.
english translation
asya zrIsauramaMtrasya devabhAga RSistataH ॥ chando gAyatramityuktaM devassUryo mahezvaraH ॥ 9॥
hk transliteration by Sanscript