Bhagavad Gita 6.2

यं संन्यासमिति प्राहुर्योगं तं विद्धि पाण्डव।न ह्यसंन्यस्तसङ्कल्पो योगी भवति कश्चन ॥६.२॥

yaṃ saṃnyāsamiti prāhuryogaṃ taṃ viddhi pāṇḍavana hyasaṃnyastasaṅkalpo yogī bhavati kaścana

Do you, O Arjuna, know that Yoga is what they call renunciation; no one indeed becomes a Yogi who has not renounced their thoughts.

गीता