I have often heard of Jesus being our high priest, but thinking about Jesus being the apostle was a new concept. Maybe that is the case for you. Apostle means "sent out one." Before Jesus ascended into heaven, He called his disciples around him and sent them out, giving them the status of apostleship. Even Paul, called himself an apostle, as though he was born late, since Jesus appeared to him after the ascension (Acts 9, 1 Cor. 15:8).
But what does it mean that Jesus is the apostle and how can we fix our thoughts on this aspect of Jesus?
We must go to the book of John to get Jesus' version of His "apostleship" from the Father:
John 7:16 So Jesus answered them and said, "My teaching is not Mine, but His who sent Me.