One verse

Bhagavad Gita 17.28

17.28

अश्रद्धया हुतं दत्तं तपस्तप्तं कृतं च यत् | असदित्युच्यते पार्थ न च तत्प्रेत्य नो इह ||१७-२८||

aśraddhayā hutaṃ dattaṃ tapastaptaṃ kṛtaṃ ca yat . asadityucyate pārtha na ca tatprepya no iha ||17-28||

aśraddhayā
without faith
hutam
offered in sacrifice
dattam
given
tapaḥ
penance
taptam
executed
kṛtam
performed
ca
also
yat
that which
asat
false
iti
thus
ucyate
is said to be
pārtha
O son of Pṛthā
na
never
ca
also
tat
that
pretya
after death
na u
nor
iha
in this life

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.