Bhagavad Gita 3.4

No one can attain freedom from action by abstaining from action, nor can they reach perfection by simply not acting.

न कर्मणामनारम्भान्नैष्कर्म्यं पुरुषोऽश्नुते।
न च संन्यसनादेव सिद्धिं समधिगच्छति॥

na karmaṇāmanārambhānnaiṣkarmyaṃ puruṣo'śnute|
na ca saṃnyasanādeva siddhiṃ samadhigacchati||

English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).