Ṣaḍviṃśa Brāhmaṇa ("26th" book) 32.1

Ṣaḍviṃśabrāhmaṇa 32.1

atha mādhyaṃdinasavanasaṃbandhina upahavān darśayati—
mādhyaṃdine savane savanamukhīyeṣvāhateṣūpahavamicchate