Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 27.6.2

27.6.2

aṣṭau vasava ekādaśa rudrā dvādaśa ādityā indro dvātriṃśa ity eṣā devatyā anuṣṭup dvātriṃśī bhavati / (soma: daśamam ahah)

Eight Vasus, eleven Rudras, twelve Ādityas, Indra as the thirty-second—thus this divine Anuṣṭubh becomes the thirty-second.