That is an easy thing to misunderstand.
Jesus' message was given to Jews who heard Him preach before the Church age had begun.
That refers to when Jews will be suffering on earth during the seven year Tribulation.
Those who endure to the end?
They will be delivered, and will be entered into the promised new heaven and new earth of the Millennium.
The Jews had promises in the OT concerning entering into the Millennial reign of their Messiah.
They knew it as the Kingdom of God.
New Heavens and a New Earth
“See, I will create
new heavens and a new earth.
The former things will not be remembered,
nor will they come to mind.
But be glad and rejoice forever
in what I will create,
for I will create Jerusalem to be a delight
and its people a joy."
Isaiah 65:17-18
That is why the Jews were asking Jesus about when will the kingdom of God be set up on earth!
That is what Jesus, who was teaching as the perfect rabbi, was referring about. That Jews endure to be delivered (saved)
and enter into the Kingdom on earth!
The Church is promised a heavenly kingdom.
We will reign with Christ on earth.
Jews will live on the new earth under Christ.
Be best if we look at what JESUS is taking about.
Matthew 24:1 And Jesus went out, and departed from the temple: and his disciples came to him for to shew him the buildings of the temple.
2 And Jesus said unto them, See ye not all these things? verily I say unto you, There shall not be left here one stone upon another, that shall not be thrown down.
3 And as he sat upon the mount of Olives, the disciples came unto him privately, saying, Tell us, when shall these things be? and what shall be the sign of thy coming, and of the end of the world?
4 And Jesus answered and said unto them, Take heed that no man deceive you.
5 For many shall come in my name, saying, I am Christ; and shall deceive many.
6 And ye shall hear of wars and rumours of wars: see that ye be not troubled: for all these things must come to pass, but the end is not yet.
7 For nation shall rise against nation, and kingdom against kingdom: and there shall be famines, and pestilences, and earthquakes, in divers places.
8 All these are the beginning of sorrows.
9 Then shall they deliver you up to be afflicted, and shall kill you: and ye shall be hated of all nations for my name's sake.
10 And then shall many be offended, and shall betray one another, and shall hate one another.
11 And many false prophets shall rise, and shall deceive many.
12 And because iniquity shall abound, the love of many shall wax cold.
13 But he that shall endure unto the end, the same shall be saved.
14 And this gospel of the kingdom shall be preached in all the world for a witness unto all nations; and then shall the end come.
He is speaking of the end times and the warning of false prophets and what is to come so they can prepare themselves so they don't fall for the tricks of Satan.
JESUS gave us a path to be reborn, Believe, repent, get baptized in JESUS WONDERFUL name to get rid of our sins and we still need JESUS to fill us with HIMSELF HIS spirit to be reborn. John 3:5, Acts 2:38
BUT TODAY, false prophets saying once saved always saved.
We are saved by faith or grace alone.
It was all finished at the cross.
Paul preached a different message.
Say this prayer and your saved, being baptized is for show.
Being baptized in JESUS titles and not HIS NAME.
Here is what happens to those WHO DO NOT FOLLOW what HE says we must do to be saved.
Matthew 7,
21 Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
24 Therefore whosoever heareth these sayings of mine, and doeth them, I will liken him unto a wise man, which built his house upon a rock:
25 And the rain descended, and the floods came, and the winds blew, and beat upon that house; and it fell not: for it was founded upon a rock.
26 And every one that heareth these sayings of mine, and doeth them not, shall be likened unto a foolish man, which built his house upon the sand:
27 And the rain descended, and the floods came, and the winds blew, and beat upon that house; and it fell: and great was the fall of it.
28 And it came to pass, when Jesus had ended these sayings, the people were astonished at his doctrine:
29 For he taught them as one having authority, and not as the scribes.
NOTICE AFTER he sent people TO HELL WHO WORKED for him maybe their whole life HE SPEAKS OF FOUNDATION.
Foundation is the key.
ALL IN LOVE.