Acts 1:8 says “But you shall receive power when the Holy Spirit comes upon you.”
In acts 2 there were 120 of Jesus’ followers who waited for the “promise of the Father” which would come to them in the city of Jerusalem. This promise came from Jesus in Luke 24:49 “Behold, I send the Promise of my Father upon you; but tarry in the city of Jerusalem until you are endued with power from on high.” The word for power is “dunamis” which is a divine enablement or ability that is not natural, but supernatural. The plural of this word is “dunameis” which means powers, miracles coming out of that mighty power of God inherent in Christ and which power is lent to His witnesses and ambassadors.
After the Acts 2:4 empowerment of the Holy Spirit at Pentecost, the Apostles received a supernatural enablement that turned their fear into faith and opened a new boldness that put them out onto the streets preaching Jesus in the face of arrest, imprisonment and even martyrdom. “And as they spoke unto the people, the priests and the captain of the temple, and the Sadducees came upon them, and they put them in jail until the next day….and they called them, and commanded them not to speak at all or teach in the name of Jesus.” Acts 4:1, 3, 18
What did the Apostles do? They preached! “And with great power the Apostles gave witness to the resurrection of the Lord Jesus.” Acts 4:33 “And many signs and wonders were done through the Apostles.” Acts 2:43
Pentecost is for those who hunger and thirst for God’s presence and power, those willing to be made bold so they can proclaim Christ - even if it means prison or death. The baptism of the Holy Spirit is described as The Gift promised by the Father. (Acts 1:4; 2:38) A gift is defined as “an offer and an acceptance (act of receiving) without consideration.” A gift is not completed until someone receives that which is freely offered.
The Holy Spirit has already been offered. It is incumbent upon each of us to receive His Spirit.
“Receive ye the Holy Spirit.” - John 20:22
“And ye shall receive the gift of the Holy Spirit.” - Acts 2:38
“The Holy Spirit, which they that believe on Him should receive.” - John 7:39
“He said unto them, ‘Have ye received the Holy Spirit since you believed?’” - Acts 19:2