בראשית, פרק ה׳, פסוק ז׳

The family records detailing early history generally follow a steady, repeating rhythm. The account of Seth's life closely parallels that of his father, Adam. Despite slight changes in how the passing of time is phrased, the underlying meaning remains exactly the same. When recording the span of Seth's remaining life, the total is built upon a primary base of eight centuries, to which his final seven years are added [קאסוטו].