Yoga Sutras of Patanjali · 1.26

स पूर्वेषामपि गुरुः कालेनानवच्छेदात् ॥२६॥

sa pūrveṣāmapi guruḥ kālenānavacchedāt

Ishvara is the teacher of even the ancients, being unconditioned by time.

— Yoga Sutras of Patanjali 1.26

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).