Yoga Sutras of Patanjali · 3.9

व्युत्थाननिरोधसंस्कारयोरभिभवप्रादुर्भावौ निरोधक्षणचित्तान्वयो निरोधपरिणामः॥९॥

vyutthāna-nirodha-saṁskārayoḥ abhibhava-prādurbhāvau nirodhakṣaṇa-cittānvayo nirodha-pariṇāmaḥ

The transformation called nirodha occurs at the moment when the outgoing impressions subside and the restraining impressions arise — the mind, in that instant, is connected with restraint.

— Yoga Sutras of Patanjali 3.9

Source: Sanskrit attributed to Patanjali (c. 2nd century BCE – 4th century CE). Public-domain English readings drawn from Swami Vivekananda's 'Raja Yoga' (1896) and Charles Johnston's 'The Yoga Sutras of Patanjali' (1912).