All the Gospels contain instances of Jesus giving the Great Commission to His disciples, but evidently He did not just give it once. The contexts are different suggesting that He repeated these instructions on at least four separate occasions. This fact obviously reflects the importance of this instruction. The charge that Luke recorded here and in Acts 1:8 was apparently the last one that Jesus gave. The chronological order seems to have been John 20:21; Mark 16:15; Matthew 28:19-20; and Luke 24:46-49 and Acts 1:8. This last one occurred just before Jesus" ascension into heaven. [source][source][source]