Shiva Purana
एवं तृतीयावरणे समभ्यर्च्य दिवाकरम् ॥ ब्रह्माणमर्चयेत्पश्चात्त्रिभिरावरणैः सहः ॥ ३७ ॥
After worshipping the sun in the third Āvaraṇa he shall worship Brahmā along with the three Āvaraṇas.
english translation
evaM tRtIyAvaraNe samabhyarcya divAkaram ॥ brahmANamarcayetpazcAttribhirAvaraNaiH sahaH ॥ 37 ॥
hk transliteration by Sanscript