Prior to His ascension, Jesus gave His disciples the mandate to go into all the world with the gospel (Matt 28- 18-20; Acts 1:8). We read in Luke that they were to wait in Jerusalem until they were endued with power from on High (Luke 24:49). This power came from the promised Holy Spirit, poured out upon the disciples, equipping them for the overwhelming task of worldwide evangelism. Likewise, we too are commanded to go and teach all nations; we too are in need of the same power that comes from the presence of the Holy Spirit filling our lives, if we are to fulfill the great commission.
After Christ’s ascension we read of the disciples obedience to the command of Christ to wait.
Then returned they unto Jerusalem from the mount called Olivet, which is from Jerusalem a sabbath days journey. And when they were come in, they went up into an upper room, where abode both Peter, and James, and John, and Andrew, Philip, and Thomas, Bartholomew, and Matthew, James the son of Alphaeus, and Simon Zelotes, and Judas the brother of James. These all continued with one accord in prayer and supplication, with the women, and Mary the mother of Jesus, and with his brethren. (Acts 1:12-14 KJV)
And when the day of Pentecost was fully come, they were all with one accord in one place. (Acts 2:1 KJV)
Notice that they were all of one accord. This is speaking of a unity that they shared, a common purpose in seeking the filling of the promised Holy Ghost, so that they could go into all the world as ambassadors for Christ. They remained steadfast in prayer for ten days, until the Holy Ghost came with the sound of a rushing wind, with tongues of fire setting upon each of them, filling them with His presence (Acts 2:2-4). They were in unity, united in purpose, desiring above all else to be filled and equipped for what Christ had called them to. Imagine that in the midst of their wait, they became discouraged and began to bicker and argue among themselves. Would they have still received the promise of the Spirit? Would they have succeeded in the fulfillment of the great commission? Perhaps they would have never even got started.
Read the word of exhortation Paul give to the Church in Philippi,
Only let your conversation be as it becometh the gospel of Christ: that whether I come and see you, or else be absent, I may hear of your affairs, that ye stand fast in one spirit, with one mind striving together for the faith of the gospel. (Phil 1:27 KJV)
We can see the importance of unity within the body of Christ. When unity exists, when we are united in purpose, seeking first the kingdom of God, putting our self interests aside, we accomplish much for the Kingdom of Christ. Let Christians become divided however, and His cause suffers. We must be ever careful to keep the mandate of our Lord in front of us, not allowing ourselves to lose our unity of purpose.