One verse

Bhagavad Gita 16.24

16.24

तस्माच्छास्त्रं प्रमाणं ते कार्याकार्यव्यवस्थितौ | ज्ञात्वा शास्त्रविधानोक्तं कर्म कर्तुमिहार्हसि ||१६-२४||

tasmācchāstraṃ pramāṇaṃ te kāryākāryavyavasthitau . jñātvā śāstravidhānoktaṃ karma kartumihārhasi ||16-24||

tasmāt
therefore
śāstram
the scriptures
pramāṇam
evidence
te
your
kārya
duty
akārya
and forbidden activities
vyavasthitau
in determining
jñātvā
knowing
śāstra
of scripture
vidhāna
the regulations
uktam
as declared
karma
work
kartum
do
iha
in this world
arhasi
you should

One should therefore understand what is duty and what is not duty by the regulations of the scriptures. Knowing such rules and regulations, one should act so that he may gradually be elevated.