Atharvaveda 15.14.8

15.14.8

[14.15]a) sá yán manuṣyā̀n ánu vyácalad agnír bhūtvā́nuvyàcalat svāhākārám annādáṃ kr̥tvā́ | [15]
[14.16]b) svāhākāréṇānnādénā́nnam atti yá eváṃ véda ||8|| [16]

⌊15.⌋ As he moved out toward men (manuṣyà), Agni, coming into being, moved out after, making the cry svā́hā ('hail') [his] food-eater; ⌊16.⌋ with the cry svā́hāas food-eater doth he eat food who knoweth thus.