Adam Clarke on Hebrews 7:14

For it is evident - As the apostle speaks here with so much confidence, it follows that our Lord's descent from the tribe of Judah was incontrovertible. The genealogical tables, both in Matthew and Luke, establish this point; and whatever difficulties we may find in them now, there were none apprehended in those days, else the enemies of the Gospel would have urged these as a chief and unanswerable argument against Christ and his Gospel.