Shatapatha Brahmana 9.4.4.15

9.4.4.15

taṃ haike | prāyaṇīya evātirātre yuñjantyudayanīye vimuñcanti saṃsthārūpaṃ vā etadyadvimocanaṃ kim purā saṃsthāyai saṃsthārūpaṃ kuryāmeti na tathā kuryādaharaharaharvā eṣa yajñastāyate 'harahaḥ saṃtiṣṭhate 'haraharenaṃ svargasya lokasya gatyai yuṅkte 'haraharenena svargaṃ lokaṃ gacati tasmādaharahareva yuñjyādaharaharvimuñcet

Now, some yoke it (the fire-altar) at a Prâyanîya Atirâtra, and unyoke it at an Udayanîya, saying, 'The unyoking, surely, is a certain form of completion, and why should we perform a form of completion prior to the completion (of the sacrifice)?' But let him not do this, for day by day this sacrifice is performed, and day by day it comes to completion; day by day he yokes that (altar) for the attainment of the heavenly world, and day by day he thereby attains the heavenly world: let him therefore yoke it day by day, and unyoke it day by day.