וַֽיְחִי־שֵׁ֗ת אַֽחֲרֵי֙ הוֹלִיד֣וֹ אֶת־אֱנ֔וֹשׁ שֶׁ֣בַע שָׁנִ֔ים וּשְׁמֹנֶ֥ה מֵא֖וֹת שָׁנָ֑ה וַיּ֥וֹלֶד בָּנִ֖ים וּבָנֽוֹת׃
And Seth lived after he begot Enosh eight hundred and seven years, and begot sons and daughters.
Read midrashic interpretation of Genesis 5:7: and classical rabbinic exegesis.