Acts 1:8 But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.
Just before Jesus left this Earth He left instructions with His followers to continue to do what He began to do and teach. The baptism of the Holy Ghost, which the disciples received on the day of Pentecost, is the key to doing the works Jesus did and greater works. All that followed in the book of Acts was the outcome of their experience of receiving the power of the Holy Ghost. When Jesus walked this earth His ministry was localized, or wherever His body was. The sending of the Holy Ghost brought the ministry of Jesus from a local ministry to a worldwide ministry through His Body, the Church, on the day of Pentecost.
Evangelizing has an outward bound vision, commission, and power to it. The vision of the harvest field is outward “Lift up your eyes and look on the fields,” John 4:35. The commission has an outward bound initiative to it “Go ye into all the world,” Mark 16:15. The power to evangelize has an outward bound thrust to it, “And you shall be witnesses unto me both in Jerusalem, Judaea, Samaria, and unto the uttermost parts of the Earth,” Acts 1:8.
When Jesus said we would receive power and be witnesses, He gave us the same Spirit that He had to do what He did. Jesus was evangelistic and witnessed in Jerusalem, Judea, and Samaria leading by His example. Jesus witnessed in:
Jerusalem – John 2:23-25; 3:1-21.
Judaea – John 3:22, 23.
Samaria – John 4:3.
There is a harvest in our own world. Not the far, far away world but the world we contact every day in our city, county, and region. Yes, Jesus said we’d be His witnesses both in our Jerusalem (local) and unto the uttermost parts of the Earth (foreign lands) but sometimes, ironically, we fly over a mission field to go to a mission field. God has an agenda every day in that world and we should seek to be a part of it and adapt to it.