Shiva Purana
अग्निरित्यादिभिर्मंत्रैः षड्भिराथर्वणैः क्रमात् ॥ विभृज्यांगानि मूर्धादिचरणांतानि तैस्स्पृशेत् ॥ २३ ॥
The six Atharva mantras, beginning with Agni, were chanted in this order. With these one should spread the limbs, such as the head and the ends of the feet.
english translation
agnirityAdibhirmaMtraiH SaDbhirAtharvaNaiH kramAt ॥ vibhRjyAMgAni mUrdhAdicaraNAMtAni taisspRzet ॥ 23 ॥
hk transliteration by Sanscript