Jaiminīya (Talavakāra) Brāhmaṇa 2-8.307.p1

2-8.307.p1

pṛṣṭhyaṣṣaḍaho'tha yatsaptamamahastasya caturviṃśaṃ bahiṣpavamānaṃ

There is the pṛṣṭhya six-day period; then as to what the seventh day is: its Bahiṣpavamāna is twenty-fourfold;