Act13,1 In the church at Antioch there were prophets and teachers: Barnabas, Simeon called Niger, Lucius of Cyrene, Manaen (who had been brought up with Herod the tetrarch) and Saul. 2 While they were worshipping the Lord and fasting, the Holy Spirit said, Set apart for me Barnabas and Saul for the work to which I have called them. 3 So after they had fasted and prayed, they placed their hands on them and sent them off.

~The Holly Spirit is talking to 3prophets in Antioch about Barnabas&Saul.
~The Holly Spirit is not talking directly to Barnabas&Saul.
~The Holly Spirit knew before, that Barnabas&Saul will end up in strong dispute and part form each other.
~Even the Holly Spirit selected them together - later on they will still depart from each other. They will not stay faithful to this Plan.

~But three guys had the same vision about Barnabas&Paul > So it was true.
~Then they send them off - GO! - And they GO!
~>Am i doing, what i know i am supposed to do?