John 5:43

I am come, &c., in My Father's name, as the Son-sent by God the Father, that by His authority I may fulfil those things which He has promised to you concerning Messiah, to His alone praise and glory, so that through Him there may be showered upon you the knowledge of God, grace, salvation, and eternal life. This I have clearly proved to you by the many testimonies which the Father hath given Me. Yet ye do not receive Me, but treat Me as a false prophet. Wherefore by the just judgment of God it shall come to pass, that if another, who is really a false prophet, shall come to you, one who is not sent by God, but who shall come in his own name, i.e., in his own authority, falsely boasting himself to be the Messiah, such an one ye will receive. Another therefore will be that Antichrist whom the Jews will receive, though they rejected Christ. To this apply the words of Paul (2 Thes. ii. 10), "Therefore God shall send upon them the working of error, that they may believe a lie, that all may be judged, who have not believed the truth, but have consented to iniquity." So SS. Chrysostom, Cyril, Augustine, and the ancient writers , passim. Again , another may mean any false prophet, pretending to be Christ, and therefore a forerunner of Antichrist, like that Egyptian, shortly after the time of Christ, who led thousands of men to destruction (see Jos. Bell. Jud. lib. 2, c. 12).