Rabbi Yeshua [Jesus] was among his talmidim [disciples/students] for 40 days after his resurrection, explaining them several things. Before his resurrection, he was 24/7 with 12 of his talmidim, being their Master/Teacher and learning and explaining them the Torah and the Profits. He did this for at least one year, and according to most of us he ministered for 3 years.
He spoke the words of verse 19 and 20a to his 11 remained talmidim, who were 24/7 with him before his death. We can read this in verse 16 of Matthew 28. Yeshua told them to go from Jerusalem to a mountain in Galil and there Yeshua spoke the words, written in Matthew 28:18-20, to those 11 remained talmidim.
Yeshua taught, being a Jew, his talmidim who were all Jews as well.
I believe there were also people from different houses/nations among the listeners when Yeshua spoke to the crowd because of the many sings he has given. But all of them new the rites and habits [customs], which is today described as Judaism.
If we take above mentioned to the test, using our Bibles, can we still say it is logical to think that once becoming a born-again Christian one has to go out and fulfill the commandment to teach and baptize all men from all the nations to become Christians? Isn’t that taking Yeshua’s words out of context?
Being young of 12/13 years of age, every Jew takes a vow to know the Instruction [Torah] of יהוה and to be familiar with the consequences that follows after obeying/disobeying it, and that the consequences will be on their own shoulders, instead of on their parents/educators shoulders.
Let’s take those 11 remained talmidim and follow them through their lives experience and growing in their faith, until the age of 30/40 when they met a rabbi who was speaking about the TaNaKH [Torah = Instructions; Nevi’im = Profits; Ketuvim = Scriptures / OT = Old Testament] in such a way, that they would follow him and therefore being their talmidim for 24/7 a day for at least one year.
Then a dark period arrives when their Shepperd was separated from his flock and his flock, on their turn, run away each a side. And by doing so, they showed everyone that all their rabbi taught them, they haven’t understood. And, the moment they saw their rabbi again after his resurrection, they still haven’t understood. Although some of them opened their eyes bit-by-bit. Ditto during Yeshua’s Aliyah [going up] to HaMikdash [The Palace/Temple] in HaShamayim [The Heavens].
Yeshua didn’t just said: “Go up, teach all the nations, baptizing them in the name of …” (Mt. 28:19). He also told them: “Do not leave Jerusalem, until you have received the promise from the Father, of which you have heard of by me, because you will be baptized by the Ruach HaKodesh [Spirit of God].” (Acts 1:4-5.) And that is what they did after Yeshua’s Aliyah!
So, why does one pretend these days that everybody must obey Yeshua’s commandment: “Go …”, without knowing what Yeshua taught, and most of the time hasn’t received the Ruach HaKodesh to start with?