Jñāneśvarī (commentary on the Bhagavadgītā) 4.90

4.90

maga varṇāśramāsi ucita |
je viśeṣā karma vihita |
teṃhī voḷakhāveṃ niścita |
upayogeṃsīṃ ||

Then, what is appropriate to one's social class and stage of life, / that specific prescribed action, / must also be recognized with certainty / along with its application.