The Great Epic of the Bhārata dynasty 6.38.24

6.38.24

tasmācchāstraṃ pramāṇaṃ te kāryākāryavyavasthitau |
jñātvā śāstravidhānoktaṃ karma kartumihārhasi || 24 ||

So let the Shâstra be thy authority in ascertaining what ought to be done and what ought not to be done. Having known what is said in the ordinance of the Shâstra, thou shouldst act here.
The end of the Sixteenth Chapter designated: The Classification of the Divine and the Non-Divine Attributes.