Bhagavad Gita 3.4
न कर्मणामनारम्भान्नैष्कर्म्यं पुरुषोऽश्नुते। न च संन्यसनादेव सिद्धिं समधिगच्छति।।3.4।।
na karmaṇāmanārambhānnaiṣkarmyaṃ puruṣo'śnute| na ca saṃnyasanādeva siddhiṃ samadhigacchati||3.4||
na karmanamanarambhannaishkarmyam purusho'shnute na ca samnyasanadeva siddhim samadhigacchati3.4
Meaning
One cannot attain freedom from karma merely by abstaining from action, nor can one reach perfection simply by renouncing all activities. Action performed without attachment is the key.
कर्मों के न करने से मनुष्य नैष्कर्म्य को प्राप्त नहीं होता और न कर्मों के संन्यास से ही वह सिद्धि (पूर्णत्व) प्राप्त करता है।
This is verse 4 of 43 in Chapter 3 (Karma Yoga) of the Bhagavad Gita.