Yoga Sutras of Patanjali · 3.7

त्रयमन्तरङ्गं पूर्वेभ्यः॥७॥

trayam antaraṅgaṁ pūrvebhyaḥ

These three — dharana, dhyana, samadhi — are the inner limbs of yoga, in contrast to the five that precede them.

— Yoga Sutras of Patanjali 3.7

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).