Out of the Jewish Nation

The very contrast drawn with Himself shows that our Lord had Antichrist in view, and it is thus sufficiently plain that this false usurper will spring out of the Jewish nation.
This conclusion, together with many indications in the Revelation, enables us with certainty to determine the next point as to the place and seat of his power. It will be Jerusalem, for at that time the Jews will have returned in unbelief and will have built their temple (see ch. 11) and as a consequence will be morally ready to receive a false Christ (Matt. 24). The Apostle Paul declares plainly that this "man of sin," "the son of perdition," will sit "in the temple of God, showing himself that he is God." 2 Thess. 2:3, 4. We know the temple will be at Jerusalem.
Lastly, we answer the question as to the period indicated. These events take place after the rapture of the Church and before the appearing of Christ.
This agrees with the Apostle's statement in 2 Thess. 2. He says, "And now ye know what withholdeth that he [the man of sin] might be revealed in his time. For the mystery of iniquity doth already work: only he who now letteth [restraineth] will let, until he be taken out of the way. And then shall that Wicked be revealed, whom the Lord shall consume with the spirit of His mouth, and shall destroy with the brightness of His coming." vv. 6-8.
The Spirit of God in the Church (though the mystery of iniquity already works) restrains and will restrain the manifestation of the evil in the person of the "son of perdition" until the Spirit of God departs with the Church. Then room is made for the revelation of this incarnation of evil, and he will continue until destroyed by the Lord Himself at His appearing. It is clear, therefore, beyond all question, that the interval between the Lord's coming for His saints and His appearing in glory is the period of Antichrist's rise and power.
Returning now to our chapter, two things are specially noted. First, this beast had two horns like a lamb.