Jesus' followers were waiting in Jerusalem for for the power Jesus told them to wait for when he was lifted up into heaven.
Ten days they waited and then...Acts 2:2 And suddenly there came from the sky a noise like a strong driving wind, and it filled the entire house in which they were. Then there appeared to them tongues as of fire which parted and came to rest on each one of them. And they were all filled with the Holy Spirit and began to speak in different tongues, as the Spirit enabled them to proclaim.
What a gift...good for us it was not a one time gift...we can call upon the Holy Spirit at any time...We can ask for one of the gifts of the Spirit and we can revel in the gifts we have already