The Twenty Fourth Proof that Clement of the Alexandrian See of St. Mark Was a Prominent Leader of the Tradition Irenaeus Identifies as 'Marcosian'

24. Irenaeus says that the Marcosians hold that "the number, too, of the apostles; and, in fine, every event which embraces in it the number twelve,--set forth their Duodecad. And then the union of all these, which is called the Thirty (Triacontad), they strenuously endeavour to demonstrate by the ark of Noah, the height of which was thirty cubits ... and if they meet with any other like numbers, they still apply these to their Triacontad." [AH i.18.4]

Clement writes that "thirty, or as in some, twelve, they say points out the preaching [of the Gospel]; because the Lord preached in His thirtieth year; and the apostles were twelve. And the structure's terminating in a cubit is the symbol of the advancement of the righteous to oneness and to "the unity of the faith." [Stromata vi.11]

If you want to know the Jewish messianic truths behind Christianity buy my book, the Real Messiah here