Luke 3:23

Irenaeus Against Heresies Book I

And for this reason they affirm it was that the "Saviour"-for they do not please to call Him "Lord"-did no work in public during the space of thirty years,[13]

Irenaeus Against Heresies Book II

For how could He have had disciples, if He did not teach? And how could He have taught, unless He had reached the age of a Master? For when He came to be baptized, He had not yet completed His thirtieth year, but was beginning to be about thirty years of age (for thus Luke, who has mentioned His years, has expressed it: "Now Jesus was, as it were, beginning to be thirty years old,"[153]

Julius Africanus The Epistle to Aristides

But if, with Luke, we reckon them from Nathan the son of David, in like manner the third from the end is Melchi, whose son was Heli the father of Joseph. For Joseph was the son of Hell, the son of Melchi.[11]