BG - 8.17

सहस्रयुगपर्यन्तमहर्यद्ब्रह्मणो विदुः। रात्रिं युगसहस्रान्तां तेऽहोरात्रविदो जनाः।।8.17।।

sahasra-yuga-paryantam ahar yad brahmaṇo viduḥ rātriṁ yuga-sahasrāntāṁ te ’ho-rātra-vido janāḥ

• sahasra - one thousand
• yuga - age
• paryantam - until
• ahaḥ - one day
• yat - which
• brahmaṇaḥ - of Brahma
• viduḥ - know
• rātrim - night
• yuga-sahasra-antām - lasts one thousand yugas
• te - they
• ahaḥ-rātra-vidaḥ - those who know his day and night
• janāḥ - people

Translation

Those who know the day of Brahma, which lasts a thousand Yugas, and the night, which also lasts a thousand Yugas, know day and night.

Commentary