Śatapatha Brāhmaṇa ("of a hundred paths") 2.3.2.14

2.3.2.14

eteṣāmekaṃ saṃvatsaramupertset | svayaṃ juhvadyadi vāsyānyo juhuyādatha yo 'nyathānyathā juhoti yathāpo vābhikhanannanyadvānnādyaṃ sa sāmi nivartetaivaṃ tadatha yaḥ sārdhaṃ juhoti yathāpo vābhikhanannanyadvānnādyaṃ tatkṣipre 'bhitṛndyādevaṃ tat

Let him endeavour to adhere to some one of these (gods or fires) for a year, whether he (the householder) himself offer (the Agnihotra) or some one else offer for him. If, on the other hand, he offers now in this way, now in another, it is just as if, in digging for water or some other food, one were to leave off in the midst of it. But if he offers uniformly, it is just as if, in digging for water or some other food, one lays it open forthwith.