Luke 24:49 And behold, I am sending the promise of my Father upon you. But stay in the city until you are clothed with power from on high.
Before Jesus departed from His disciples to be with His Father, He relayed to them a promise. This promise caused their entire lives to change. These ordinary fishermen, tax collectors, and otherwise nobodies took part in the birth of a movement that would turn the world upside down. That is, after the promise, and after they waited for it.
When Jesus gave His followers the Great Commission in Matthew 28:18-20, He didn’t send them out alone to accomplish His will. He told them that with his departure would come another. The Holy Spirit would be poured out on them, just as promised, and they would receive power from God to do everything they needed to do to bring about His purposes. The power of the Holy Spirit changed them from cowards who ran at the time of Jesus’ arrest and trials to bold evangelists who proclaimed the Gospel to thousands upon thousands.
They waited for this power because they knew Jesus was true to His word. The man who predicted that He would rise from the dead had more than earned their trust. They knew the power would come and they knew when He showed up. There was no reason left to question, only reason to act. And the Holy Spirit helped them to do that too.