He was destined to reign and rule with Christ and the other Apostles in the age to come.
Okay, I'm hoping this won't turn into an extended debate between us. Maybe we can make this the
last iteration since I'm sure neither of us will convince the other. The reason I feel it necessary to reply is that by your incorrect portrayal of the doctrines of election and eternal salvation, you also reduce Christ's achievement.
It was always God the Father's plan that Jesus would be crucified. Central to it was Judas Iscariot.
Had Judas not fulfilled the role God had anticipated for him, our salvation would not be possible. To accomplish that plan, Judas had to be a part of Christ's innermost circle. However, this does not mean that Judas was ever of the elect, only that he had a part in bringing the crucifixion to fruition. It was critical that those who were responsible for the crucifixion, especially Judas, not become aware of God's larger goal: God had ordained this plan before the world began. Please see the following:
[[
1Co 2:7-8 KJV]
7 But we speak the wisdom of God in a mystery, [even] the hidden [wisdom], which
God ordained before the world unto our glory:
8 Which none of the princes of this world knew: for had they known [it],
they would not have crucified the Lord of glory.
Judas received the spirit of the world; he did not receive the Spirit which is of God:
[
1Co 2:13-14 KJV]
12 Now
we have received, not the spirit of the world, but
the spirit which is of God; that we might know the things that are freely given to us of God.
13 Which things also we speak, not in the words which man's wisdom teacheth, but which the Holy Ghost teacheth; comparing spiritual things with spiritual.
14
But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him:
neither can he know [them], because they are spiritually discerned.
How can we know that?
[
Jhn 6:70 KJV]
70 Jesus answered them, Have not I chosen you twelve,
and one of you is a devil?
Even then was Judas a devil.
In order for God's plan to be kept a secret, Judas had to be treated in all ways, exactly like the other apostles until his betrayal of Jesus was completed.
[
Jhn 6:64 KJV]
64 But there are some of you that believe not. For Jesus knew
from the beginning who they were that believed not, and who should betray him.
Jesus knew that Judas believed not and would betray him, so there is no doubt that he was not of the elect, even though he was very close to Jesus.
So, Jesus knew this from the beginning? The beginning of what? From the beginning of the world.
Therefore, It is not possible that Judas's betrayal of Jesus was only by a momentary lapse in judgement (as you seem to indicate) which will ultimately be ignored by God so he can "reign and rule" in the age to come. Jesus unquestionably informs us otherwise by the following verse:
[
Mar 14:21 KJV]
21 The Son of man indeed goeth, as it is written of him: but
woe to that man by whom the Son of man is betrayed! good were it for that man if he had never been born.