Yoga Sutras of Patanjali · 3.3

तदेवार्थमात्रनिर्भासं स्वरूपशून्यमिव समाधिः॥३॥

tad eva arthamātranirbhāsaṁ svarūpaśūnyam iva samādhiḥ

Samadhi is when only the object of meditation shines forth, as if the self-form of the meditator has become empty.

— Yoga Sutras of Patanjali 3.3

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).