Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 2.4.7

2.4.7

tā daśa sampadyate /

ii. 3. ‘In the Āhavanīya only should he offer’ some say, but he should offer in all, for they are established for the offering. Four (are offered) in the Gārhapatya, four in the Anvāhāryapacana, two in the Āhavanīya; these make up ten; the Virāj consists of series of ten; the Virāj is prosperity and proper food; (they serve) for obtaining the Virāj as prosperity and proper food. He who offers the Agnihotra with the Virāj thus included obtains all desires.