Bhagavad Gita 17.28

17.28 Whatever is sacrificed, given or performed, and whatever austerity is practised without faith, it is called 'Asat', O Arjuna; it is naught here or hereafter (after death).

Anything done as sacrifice, charity or penance without faith in the Supreme, O son of Pṛthā, is impermanent. It is called asat and is useless both in this life and the next.