Bhagavad-gītā 16.24
BG 16.24
Open the full passageतस्माच्छास्त्रं प्रमाणं ते कार्याकार्यव्यवस्थितौ । ज्ञात्वा शास्त्रविधानोक्तं कर्म कर्तुमिहार्हसि ॥२४॥
Sanskrit
tasmāc chāstraṁ pramāṇaṁ te kāryākārya-vyavasthitau jñātvā śāstra-vidhānoktaṁ karma kartum ihārhasi
Translation
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.