Where in the Bible does it say Until all have heard the word of the Lord?

Answer 1

You are referring to end time prophecy which was foretold by Christ on the Mount of Olives, however you quote of that scripture is not exactly correct. The text is given in Matthew 24:14, Mark 13:10-11, Luke 21:13-15, and Revelation 14:6

You must however understand what is going to occur and why. In all those chapters identified above that teaching of the gospel comes after the elect have been delivered up before the global world order of Anti-Christ. Each one of the elect who are delivered up, will have trial that lasts a maximum of 10 days (Revelation 2:10).

This is a repeat of what occurred in Acts chapter 2, where the Holy Spirit gives utterance to those elect who are delivered up. This is the presence of the Holy Spirit and how it will teach the gospel.

Acts chapter 2:

"Now when this was noised abroad, the multitude came together and were confounded, because that every man heard them speak in his own language.... But this is that spoken by the prophet Joel (Joel 2:28-32);

And it shall come to pass, in the last days, saith God, I will pour out my Spirit upon all flesh: and your sons and your daughters shall prophesy, and your young men shall see visions, and your old men shall dream dreams: And on my servants and on my handmaids I will pour out in those days of my Spirit; and they shall prophecy...

And it shall come to pass, that whosoever shall call upon the name of the Lord shall be saved.

Saved from what? Revelation 14:9 &10 - the cup of wrath, poured out upon those who worshipped Anti-Christ (Satan) as if he were the true Christ.