Manusmriti

siva.sh/manusmriti/1/68

ब्राह्मस्य तु क्षपाहस्य यत् प्रमाणं समासतः । एकैकशो युगानां तु क्रमशस्तन्निबोधत ॥ ६८ ॥

sanskrit

But hear now the brief (description of) the duration of a night and a day of Brahman and of the several ages (of the world, yuga) according to their order.

english translation

brAhmasya tu kSapAhasya yat pramANaM samAsataH | ekaikazo yugAnAM tu kramazastannibodhata || 68 ||

hk transliteration by Sanscript