Śatapatha Brāhmaṇa ("of a hundred paths") 10.4.4.2

10.4.4.2

tasya tapastepānasya ebhyo lomagartebhya ūrdhvāni jyotīṃṣyāyaṃstadyāni tāni jyotīṃṣyetāni tāni nakṣatrāṇi yāvantyetāni nakṣatrāṇi tāvanto lomagartā yāvanto lomagartāstāvantaḥ sahasrasaṃvatsarasya muhūrtāḥ

Whilst he was practising austerities, lights went upwards from those hair-pits of his; and those lights are those stars: as many stars as there are, so many hair-pits there are; and as many hair-pits as there are, so many muhûrtas there are in a (sacrificial performance) of a thousand years.