After his resurrection, Jesus was walked with two of his disciples on the road to Emmaus when he said to them,
“Thus it is written, that the Christ should suffer and on the third day rise from the dead, and that repentance and forgiveness of sins should be proclaimed in his name to all nations, beginning from Jerusalem.” Luke 24:46-47 CEV
Jesus says “it is written”, meaning that it is written in the Bible. But what Bible? When Jesus said that the New Testament had not yet been written, Jesus is saying that the Old Testament says that
repentance and forgiveness of sins should be proclaimed in his name to all nations.
Jesus had to show his disciples that proclaiming the Good News to all nations was right there in the Old Testament from the beginning. They had missed it. But consider these verses:
All the ends of the earth shall remember and turn to the LORD, and all the families of the nations shall worship before you. Psalm 22:27
I was ready to be sought by those who did not ask for me; I was ready to be found by those who did not seek me. I said, “Here am I, here am I,” to a nation that was not called by my name. Isaiah 65:1
This is the purpose that is purposed concerning the whole earth, and this is the hand that is stretched out over all the nations. For the LORD of hosts has purposed, and who will annul it? His hand is stretched out, and who will turn it back? Isa 14;26 – 27
Missions, including local and world outreach, are not an optional add-on — something tacked on in an “Oh, by the way” fashion. They are not an afterthought Jesus added at the last minute before he went back to heaven. Rather, outreach is God purpose and intention, indeed His own mission, from the beginning and throughout.