Tertullian

“ Then why does the Creator, if an adversary of Christ, not only predict that the apostles should incur this suffering, but even express His displeasure [8] thereat? For He ought neither to predict the course of the other god, whom, as you contend, He knew not, nor to have expressed displeasure at that which He had taken care to bring about. “See how the righteous perisheth, and no man layeth it to heart; and how merciful men are taken away, and no man considereth. For the righteous man has been removed from the evil person.” ”

“ Who is this but Christ? “Come, say they, let us take away the righteous, because He is not for our turn, (and He is clean contrary to our doings) .” [10] Premising, therefore, and likewise subjoining the fact that Christ suffered, He foretold that His just ones should suffer equally with Him—both the apostles and all the faithful in succession; and He signed them with that very seal of which Ezekiel spake: “The Lord said unto me, Go through the gate, through the midst of Jerusalem, and set the mark Tau upon the foreheads of the men.” ”

“ Now the Greek letter Tau and our own letter T is the very form of the cross, which He predicted would be the sign on our foreheads in the true Catholic Jerusalem, [12] in which, according to the twenty-first Psalm, the brethren of Christ or children of God would ascribe glory to God the Father, in the person of Christ Himself addressing His Father; “I will declare Thy name unto my brethren ”