Yoga Sutras of Patanjali · 1.34

प्रच्छर्दनविधारणाभ्यां वा प्राणस्य ॥३४॥

pracchardanavidhāraṇābhyāṁ vā prāṇasya

Or, by exhaling and retaining the breath.

— Yoga Sutras of Patanjali 1.34

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).