Shiva Purana
ब्रह्म विष्णू च विधिना पूजयेदुपचारकैः ॥ बाह्यरेखासु देवेशम्पञ्चमावरणे यजेत् ॥ २४ ॥
One should worship Brahma and Vishnu according to the prescribed rituals On the outer lines one should worship the Lord of the gods in the fifth covering.
english translation
brahma viSNU ca vidhinA pUjayedupacArakaiH ॥ bAhyarekhAsu devezampaJcamAvaraNe yajet ॥ 24 ॥
hk transliteration by Sanscript