You find that command in Matt. 24:13, the command to endure to the end. What end? The end the disciples asked him about in verse 3. The disciples there tied that "end," "the end of the world," or the end of the age, to Christ's 2nd coming. In answer to their question, so did Christ... throughout the discourse, including verse 13. The "end of the age" in his discourse, being "immediately after the tribulation of those days," verses 29-31.
Like I said in previous post, there is no pretrib rapture in Matt. 24, Paul merely follows Jesus in 2 Thess. 2.
I use dispensations as a tool to help organize reasoning. The Olivet6 Discourse to which you refer is given regarding the actual end times as spoken of by Daniel the Prophet. The discernment for this is found in what prompted Jesus to launch into the teaching of James, John, Andrew and Peter regarding the destruction of Jerusalem. As such we can reason that Jesus is address specifically the future of Jerusalem and Israel. The seven years of tribulation are all about God ending His dealing with sin and Israel. The Jews are even the ones evangelizing the world during that horrific period of Tribulation. Today, there is no differentiation between Jew and Gentile in the Church. During the dispensation of Tribulation the Jews specifically will be the evangelists.
BTW, you added to the verse from Revelation. There is no ‘to the end’ in the Revelation verse you are trying to twist to your no rapture agenda. Jesus tells the Philadelphia Church that because they kept His command to endure, not endure to the end because He is telling them He is going to keep them from even the hour of testing. Adding to the Revelation wording is a no no, as I sure you realize.