Brāhmaṇa of portents 6.21

Adbhutabrāhmaṇa 6.21

hastinyaśvaiva (0vyaśvaiva) maṅgale (0madyale) agnirūpaṃ tadadbhutam
agniṃ dūtaṃ vṛṇīmahe sthālīpākasya homayet