Answer: On Pentecost, the disciples were filled with
the Holy Spirit, (verse 4).
MORE INFORMATION AND/OR OTHER SCRIPTURE REFERENCES:
Luke 24:49: [Jesus said,] "I am
going to send you what My Father has promised; but stay in the city
until you have been clothed with power from on high."
John 14:25-26: [Jesus said,] "All
this I have spoken while still with you. But the Counselor,
the Holy Spirit, Whom the Father will send in My Name, will teach
you all things and will remind you of everything I have said to
you."
Acts 1:4-5: "On one occasion, while
He was eating with them, He [Jesus[ gave them this command:
'Do not leave Jerusalem, but wait for the gift My Father
promised, which you have heard Me speak about. For John
baptized with water, but in a few days you will be baptized with
the Holy Spirit.'"
Acts 1:8: [Jesus said,] "But you
will receive power when the Holy Spirit comes on you; and you will
be My witnesses in Jerusalem, and in all Judea and Samaria, and to
the ends of the earth."