Śatapatha Brāhmaṇa ("of a hundred paths") 11.2.7.3

11.2.7.3

māsā havīṃṣi sa yo ha vai māsā havīṃṣīti vedānte haivāsya māsānāmiṣṭam bhavatyatho yatkiṃ ca māseṣu kriyate sarvaṃ haivāsya tadāptamavaruddhamabhijitam bhavati

The oblations are the months; and, verily, sacrifice is offered at the end of the months of him whoso knows that the oblations are the months; and all that is done in the months comes to be gained, secured, and won for him.