Acts 1:1-3

1I composed the first discourse, O Theophilus, concerning all things which Jesus began both to do and to teach,

2until that day in which, having by the Holy Spirit charged the apostles whom he had chosen, he was taken up;

3to whom also he presented himself living, after he had suffered, with many proofs; being seen by them during forty days, and speaking of the things which concern the kingdom of 1God;