Bhagavad Gita 6.2

O Arjuna, renunciation is indeed what is known as right action. No one can become spiritually enlightened who has not renounced all desires.

यं संन्यासमिति प्राहुर्योगं तं विद्धि पाण्डव।
न ह्यसंन्यस्तसङ्कल्पो योगी भवति कश्चन॥

yaṃ saṃnyāsamiti prāhuryogaṃ taṃ viddhi pāṇḍava|
na hyasaṃnyastasaṅkalpo yogī bhavati kaścana||

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