Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 8.11.14

8.11.14

vaṣaṭ kāreṇa ha vā ṛg yāta yāmā bhavati samāne ahan / (soma: upasadah)

For a verse becomes exhausted on the same day by the vaṣaṭ-call;