Gita 16.24
तस्मात्, शास्त्रम्, प्रमाणम्, ते, कार्याकार्यव्यवस्थितौ,
ज्ञात्वा, शास्त्रविधानोक्तम्, कर्म, कर्तुम्, इह, अर्हसि।।24।।
Tasmaat’, shaastrm’, prmaanm’, te, kaaryaakaaryavyavasthitau,
Gyaatva, shaastrvidhaanoktam’, karm, kartum’, ih, arhasi ||24||
Translation: (Tasmaat’) therefore (te) for you (kaaryaakaaryavyavasthitau) in the state of what should be done and what should not be done (shaastrm’) only scripture (prmaanm’) is evidence (ih) this (gyaatva) knowing (shaastrvidhaanoktam’) in accordance with the ordinances of the scriptures (karm) acts (kartum’) to be performed (arhasi) should be / worthy of. (24)
Translation: Therefore, in the state of what should be done and what should not be done, Scripture is the only evidence for you. Knowing this, only those acts should be performed, which are in accordance with the ordinances of the scriptures.