Yoga Sutras of Patanjali · 3.18

संस्कारसाक्षात्करणात्पूर्वजातिज्ञानम्॥१८॥

saṁskāra-sākṣātkaraṇāt pūrva-jāti-jñānam

By direct perception of the latent impressions in the mind, knowledge of previous births arises.

— Yoga Sutras of Patanjali 3.18

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).