1. Paul who realized that Jesus is the Christ (Acts 9:1-5)
    Acts 22:3, Acts 22:6-9, Acts 26:9-15

Paul was an outstanding scholar of the Old Testament. So Paul knew that the Old Testament was a prophecy of Christ. And he, too, was eagerly waiting for Christ. (Act 22:3)

Act 22:3 I am verily a man which am a Jew, born in Tarsus, a city in Cilicia, yet brought up in this city at the feet of Gamaliel, and taught according to the perfect manner of the law of the fathers, and was zealous toward God, as ye all are this day.

Paul was a persecutor of those who believed in Jesus. However, after Paul met the resurrected Jesus on the road to Damascus, he realized that Jesus was the Christ. (Act 9:1-5, Act 22:6-9, Acts 26:9-15)

Act 9:1 And Saul, yet breathing out threatenings and slaughter against the disciples of the Lord, went unto the high priest,
2 And desired of him letters to Damascus to the synagogues, that if he found any of this way, whether they were men or women, he might bring them bound unto Jerusalem.
3 And as he journeyed, he came near Damascus: and suddenly there shined round about him a light from heaven:
4 And he fell to the earth, and heard a voice saying unto him, Saul, Saul, why persecutest thou me?
5 And he said, Who art thou, Lord? And the Lord said, I am Jesus whom thou persecutest: it is hard for thee to kick against the pricks.

Act 22:6 And it came to pass, that, as I made my journey, and was come nigh unto Damascus about noon, suddenly there shone from heaven a great light round about me.
7 And I fell unto the ground, and heard a voice saying unto me, Saul, Saul, why persecutest thou me?
8 And I answered, Who art thou, Lord? And he said unto me, I am Jesus of Nazareth, whom thou persecutest.
9 And they that were with me saw indeed the light, and were afraid; but they heard not the voice of him that spake to me.

Acts 26:9 I verily thought with myself, that I ought to do many things contrary to the name of Jesus of Nazareth.
10 Which thing I also did in Jerusalem: and many of the saints did I shut up in prison, having received authority from the chief priests; and when they were put to death, I gave my voice against them.
11 And I punished them oft in every synagogue, and compelled them to blaspheme; and being exceedingly mad against them, I persecuted them even unto strange cities.
12 Whereupon as I went to Damascus with authority and commission from the chief priests,
13 At midday, O king, I saw in the way a light from heaven, above the brightness of the sun, shining round about me and them which journeyed with me.
14 And when we were all fallen to the earth, I heard a voice speaking unto me, and saying in the Hebrew tongue, Saul, Saul, why persecutest thou me? it is hard for thee to kick against the pricks.
15 And I said, Who art thou, Lord? And he said, I am Jesus whom thou persecutest.