One verse

Bhagavad Gita 17.11

17.11

अफलाङ्क्षिभिर्यज्ञो विधिदृष्टो य इज्यते | यष्टव्यमेवेति मनः समाधाय स सात्त्विकः ||१७-११||

aphalāṅkṣibhiryajño vidhidṛṣṭo ya ijyate . yaṣṭavyameveti manaḥ samādhāya sa sāttvikaḥ ||17-11||

aphala-ākāṅkṣibhiḥ
by those devoid of desire for result
yajñaḥ
sacrifice
vidhi-diṣṭaḥ
according to the direction of scripture
yaḥ
which
ijyate
is performed
yaṣṭavyam
must be performed
eva
certainly
iti
thus
manaḥ
mind
samādhāya
fixing
saḥ
it
sāttvikaḥ
in the mode of goodness

Of sacrifices, the sacrifice performed according to the directions of scripture, as a matter of duty, by those who desire no reward, is of the nature of goodness.