Acts 1:3-5

3 unto whom he also showed himself alive, after he had suffered, by many infallible proofs, appearing unto them for forty days and speaking to them of the kingdom of God;

4 and gathering them together, he commanded them that they should not depart from Jerusalem, but wait for the promise of the Father, Which, [he said], ye have heard of me.

5 For John truly baptized in water, but ye shall be baptized in the Holy Spirit not many days from now.