"...Why do you seek the living One among the dead? He is not here, but He has risen..." Luke 24:5-6

In the Book of Acts Luke writes of the important events of the beginning and the growth of the Church. He continues in Acts where he left off from His gospel.
"The former account I made, O Theophilus, of all that Jesus began both to do and teach, until the day in which He was taken up, after He through the Holy Spirit had given commandments to the apostles whom He had chosen." Acts 1-1-2

Of these apostles Scripture goes on to tells us in verse 3, "To whom He also presented Himself alive after His suffering by many infallible proofs, being seen by them during forty days and speaking of the kingdom of God."

Not only was He seen by these, His apostles, after His resurrection on many occasions, but by other as well. Read the Scriptures in which the following appear to see the circumstances:
By Mary Magdalene, Mark 16:9
By two disciples on the road to Emmaus, Luke 24:15 By the other women, Matthew 28:9 By the ten disciples (Thomas wasn't present), John 20:19 & 24 By the eleven disciples, John 20:26 By the eleven disciples and those who were with them, Luke 24:36 By the disciples at the Sea of Tiberias (Galilee), John 21:1 By over 500 brethren, 1 Corinthians 15:6 By James, 1 Corinthians 15:7 By those at His ascension, Luke 24:50-51 By Paul at his conversion, Acts 9:5 and 1 Corinthians 15:8 There are some other occasions that you may want to check on your own.

Acts 1:8 tells us,
"But you shall receive power when the Holy Spirit has come upon you; and you shall be My witnesses both in Jerusalem, and in all Judea and Samaria, and even to the remotest part of the earth."

Chapter 2:1-13 of Acts tells of the filling of the Holy Spirit and the marvel of what happed!
Vs. 14-37  gives the Apostle Peter's first sermon.  I will pick out a few verses at this time.  (Please read the whole chapter.)

"Men of Israel, hear these words: Jesus of Nazareth, a Man attested by God to you by miracles, wonders, and signs which God did through Him in your midst, as you yourselves also know-- "Him, being delivered by the determined counsel and foreknowledge of God, you have taken by lawless hands, have crucified, and put to death; "whom God raised up, having loosed the pains of death, because it was not possible that He should be held by it." Vs. 22-24

"This Jesus God has raised up, of which we are all witnesses.
"Therefore being exalted to the right hand of God, and having received from the Father the promise of the Holy Spirit, He poured out this which you now see and hear." Vs. 32-34

"Therefore let all the house of Israel know assuredly that God has made this Jesus, whom you crucified, both Lord and Christ." Vs. 36

"Now when they heard this, they were cut to the heart, and said to Peter and the rest of the apostles, 'Men and brethren, what shall we do?'
"Then Peter said to them, 'Repent, and let every one of you be baptized in the name of Jesus Christ for the remission of sins; and you shall receive the gift of the Holy Spirit.
"For the promise is to you and to your children, and to all who are afar off, as many as the Lord our God will call.'" Vs. 37-39

"Then those who gladly received his word were baptized; and that day about three thousand souls were added to them."  Vs. 41

HE IS RISE! HE IS LORD!

Thank you Heavenly Father for the Holy Spirit who works mightily in man to bring about the witness of the gospel unto salvation.  All honor and glory to you Most Holy God; Father, Son and Holy Spirit!  Amen