The Great Epic of the Bhārata dynasty 6.39.28

6.39.28

aśraddhayā hutaṃ dattaṃ tapastaptaṃ kṛtaṃ ca yat |
asadityucyate pārtha na ca tatpretya no iha || 28 ||

Constancy in sacrifices, in penances and in gifts, is also called SAT, and an act, too, for the sake of That is called SAT. Whatever oblation is offered (to the fire), whatever is given away, whatever penance is performed, whatever is done, without faith, is, O son of Pritha, said to be the opposite of SAT; and that is nought both here and hereafter. '