Литература Второго Храма к Берешит 5:21

וַֽיְחִ֣י חֲנ֔וֹךְ חָמֵ֥שׁ וְשִׁשִּׁ֖ים שָׁנָ֑ה וַיּ֖וֹלֶד אֶת־מְתוּשָֽׁלַח׃

Енох жил шестьдесят пять лет и родил Мафусала.

On the Posterity of Cain and his Exile

[40] Now since Cain is said to have begotten Enoch, and there is afterwards a descendant of Seth with the name of Enoch again (Gen. 4:17, 5:18), we must consider whether they were two different persons or the same person. While we are engaged with these, let us investigate also the difference between others who have the same name. Like Enoch, Methuselah and Lamech appear as descendants of Cain, and descendants no less of Seth (Gen. 4:18, 5:21, 25).