It must have been thrilling for the disciples to speak with their resurrected master and to listen to His familiar voice, discussing the “things concerning the kingdom.” Apart from the incident recorded in the Gospels, the only fragment of teaching during the transitional period of Jesus’ forty days after His resurrection is found in Acts 1:1-8. The instructions recorded here are a greatly condensed summary of the principles given to the men to whom the Lord was entrusting the evangelization of the world and the establishment of His kingdom on earth. 

Jesus Sends Witnesses with the Holy Spirit