The Great Epic of the Bhārata dynasty 6.39.27

6.39.27

yajñe tapasi dāne ca sthitiḥ saditi cocyate |
karma caiva tadarthīyaṃ sadityevābhidhīyate || 27 ||

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. '