Acts 1:1-3

1The former account I made, O Theophilus, of all that Jesus began both to do and teach,

2until the day in which He was taken up, after He through the Holy Spirit had given commandments to the apostles whom He had chosen,

3to whom He also presented Himself alive after His suffering by many infallible proofs, being seen by them during forty days and speaking of the things pertaining to the kingdom of God.