The words of Jesus:
"Go ye therefore, and teach ALL NATIONS, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway even unto the end of the world." Amen. Matthew 28:19-20 KJV
Not quite....the Greek word translated Nations in this verse has a preferred meaning....Tribes. Gentile nations is a secondary meaning.
πορευθεντες ουν μαθητευσατε παντα τα εθνη βαπτιζοντες αυτους εις το ονομα του πατρος και του υιου και του αγιου πνευματος
The word is ETHNOS and it is the sixth word in the above Greek sentence. The "Strong's # is 1484 and can be viewed here.
As you are surely aware, Our Lord in his instructions of Matthew 10:5 also include additional instructions in verse six. But go rather to the lost sheep of the house of Israel. If you have been following along you will note that both Uncle Chip and I have given everyone proof that there were literally millions of Israelites still living in Babylon during the first century. These were the remnants of the two captivities mentioned in the books of Kings and Chronicles. And, of course we know that the previous verse had already admonished "The Twelve" to stay out of Gentile territory......and going to the "Tribes of Israel" would have certainly been part of their instructions.
Other Apostles had been given instructions to evangelize the Gentiles....but "These Twelve"....now "Eleven" were told not to. That is why we say Peter was never in Rome....he was one of the eleven.