श्रीमद् भगवद्गीता

मूल श्लोकः

सहस्रयुगपर्यन्तमहर्यद्ब्रह्मणो विदुः।

रात्रिं युगसहस्रान्तां तेऽहोरात्रविदो जनाः।।8.17।।

English Translation By Swami Gambirananda

8.17 Those poeple who are knowers of what day and night are, know the day of Brahma which ends in a thousand yugas [The four yugas (in the human worlds), viz Satya, Treta, Dwapara, and Kali are made up of 4,320,000 years. This period multiplied by a thousand constitutes one day of Brahma. His night also extends over an eal period. See M.S. and V.S.A.], and His night which ends in a thousand yugas.