Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 5.4.5

5.4.5

atha yat saptadaśa sāmidhenyaḥ sadvantāv ājya bhāgau virājau samyājye tasya uktam brāhmaṇam / (Cāturmāsya)

Now, that there are seventeen kindling verses, that the two butter portions contain the word 'sad', and that the two samyājyā offering verses are in the Virāj metre—the brāhmaṇa explanation of that has been stated.