בראשית, פרק ה׳, פסוק י׳

The records of early human history reveal remarkably long lifespans, carefully tracking the exact years these figures lived both before and after the birth of their successors. In the case of Enosh, the timeline of his later years reveals a unique numerical pattern. His remaining lifespan of eight hundred and fifteen years is structured around a solid foundation of eight hundred years. To this primary base, an extra fifteen years are added. These additional fifteen years are formed by three distinct units of time, with each unit consisting of exactly sixty months [קאסוטו].