Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 24.2.2

24.2.2

aindra vāyavīm pururucam śastvā atha ubhe aindra vāyave tṛce /

having recited the puroruc to Indravāyū, then both triplets to Indravāyū;