Śatapatha Brāhmaṇa ("of a hundred paths") 13.2.7.2

13.2.7.2

vāyuṣṭvā pacatairavatviti vāyurevainam pacatyasitagrīvaścāgairityagnirvā asitagrīvo'gnirevainaṃ cāgaiḥ pacati

[Vâg. S. XXIII, 13,] 'May Vâyu favour thee with cooked kinds of food,'--Vâyu (the wind) indeed cooks it;--'the dark-necked one with he-goats,'--the dark-necked one, doubtless, is Agni (the fire); and the fire indeed cooks it (the horse) together with the he-goats.