Yes what of it? It wasn't recorded what they taught. It was mostly Jesus who is talking.
Matthew 24:13-14
13 but the one who stands firm to the end will be saved. 14 And this gospel of the kingdom will be preached in the whole world as a testimony to all nations, and then the end will come.
God has a Kingdom and whoever stands firm until the end will be saved. The Kingdom of God will overtake the Kingdom of Satan. The Gospel of the Kingdom is the message that Jesus brought and fulfilled. The Gospel that the Apostles including Paul preached until most of them martyred.
I have already seen your interpretation that that is supposed to be a different Gospel which is a very poor interpretation.
Matt 24:13 context is key
All scripture was written for us. Not all scripture is written to us.
Scripture Study Tips
When dissecting any verse of scripture. Ask yourself, of whom, to whom, with what words, what time, where, to what intent, with what circumstances, considering what is written before and what follows any single verse context.
^^^^^Myles Coverdale, Bible theologian/translator.^^^^^
So, ask: Who is writing? Who’s it written to? What are the circumstances? What’s the context before? What's the context after?
Invariably Matt 24:13 is posted, OUT OF CONTEXT. Remove the TEXT and all that's left is the CON!
Matt 24:13 Proper Context. Who is the speaker? JESUS
Context: Who is Jesus speaking to? Verse 2 earthly/Jewish disciples. This is day 3 of passion week. The Holy Spirit has yet to be given, therefore, no Body of Christ/Christian exist.
Context: What is Jesus speaking about? Verse 3 the end of the world/age. The end of your life? NO!
Context: Verses 4-13 The prophecy here parallels the END TIME seal judgments:
Matt 24: Vs 5 - Rev 6:2 false Christ's, Vs 6 - Rev 6:3&4 war, Vs 7 - Rev: 5&6, Famine, Vs 6&7 - Rev 6:7&8 death, Vs 9-13 - Rev 6:6-11 martyers
Matt 24:14 the gospel of the kingdom =100% jewish doctrine. Quote: "and then shall the end come". The end of one's life? NO!
Vs 15 references Daniel & the abomination of desolation
Vs 16 let those where? in Judea! NOT A CHURCH GOER IN THE USA!
Vs 21 there shall be great tribulation. In your life? No! Vs 27 Christ returns. Vs 29 After the tribulation of those days, NOT your life!
Context: Matt 24 Jesus is speaking to "Jews only about Israel's Future" Fortelling the tribulation period to come. BTW the tribulation is referred to as JACOB/ISRAELS TROUBLE. Jeremiah 30:7
When reading Vs 13 he who endures to the end, we must take from scripture via context. Not adding to scripture a false doctrinal narrative.