Yōga Sūtra 3.07

त्रयमन्तरङ्गं पूर्वेभ्यः।

trayamantaraṅgaṁ pūrvēbhyaḥ।

[त्रयम् अन्तरङ्गं पूर्वेभ्यः।
trayam = these three; antaraṅgaṁ = are internal; pūrvēbhyaḥ = compared to previous;]

These three (dhāraṇā , dhyāna, samādhi) are internal compared to previous (yāma, niyama, āsana, pranayama, prtyāhāra).