As for
Mat 19:
"Matthew 19
27Peter answered him, “We have left everything to follow you! What then will there be for us?”
28Jesus said to them, “Truly I tell you, at the renewal of all things, when the Son of Man sits on his glorious throne, you who have followed me will also sit on twelve thrones, judging the twelve tribes of Israel.29And everyone who has left houses or brothers or sisters or father or mother or wife or children or fields for my sake will receive a hundred times as much and will inherit eternal life. 30But many who are first will be last, and many who are last will be first.
I think what the verse shows is that (1) Jesus loved Judas and gave him a chance for salvation and Heaven. (2) He really wanted him to be saved, no less than the other 11 Apostles. After all, He died for all, which means (3) He died for Judas too. (4) As it says in 1 Tim 2:4 and 2 Pet 3:9, God showed in Judas, who imo typifies all the reprobate, that He really wants all to be saved, and to come to the knowledge of the Truth, and is not willing that any should perish, but that all should come to repentance. (5) God washed Judas' feet no less than that of the other Apostles. And He gave him Holy Communion no less than all the other Apostles. So He gave him all the opportunities to be saved He gave to the other Apostles; He wasn't predestined to damnation or anything like that; yes, it was foreknown/foreseen that he would betray the Lord, but he could have confessed and repented of his sin, and ran to the Lord on the Cross, and the Blood of Christ would have fallen on him and washed his sin away. Instead, Judas, who till then was plotting Christ's murder thinking he could get away with anything, after the deed was done, immediately fell into despair probably thinking God could never forgive him (another trap from Satan; imo, the Enemy misleads us in two ways (1) First, before we sin, he tells us, no matter what we do, however, grave or wicked or serious it is, we will never lose the Holy Spirit; (2) then, after we sin, he tells us, now God will never forgive us. Another lie imo and the 2nd lie is worse than the first) and thus didn't go to God and so lost his soul.
So, I believe the verse contains a Conditional Promise and shows Conditional Security. Judas could have been saved, like the other 11 Apostles, and even had a throne in Heaven like them etc. Probably, later on, Matthias or Paul received it.
Here in
1 Samuel 2:30-33, we see another example of a Conditional Promise: "
30“Therefore the Lord, the God of Israel, declares: ‘I promised that members of your family would minister before me forever.’ But now the Lord declares: ‘Far be it from me! Those who honor me I will honor, but those who despise me will be disdained. 31The time is coming when I will cut short your strength and the strength of your priestly house, so that no one in it will reach old age, 32and you will see distress in my dwelling. Although good will be done to Israel, no one in your family line will ever reach old age. 33Every one of you that I do not cut off from serving at my altar I will spare only to destroy your sight and sap your strength, and all your descendants will die in the prime of life."
Here the Lord shows that obtaining the promises the Lord has given has some conditions. The Priests of Israel were given some simple commands. They were to bring the offering and make the sacrifices to the Lord. In this place, Eli's sons prevented people from doing that, taking and eating the sacrifices themselves. Hence the Word says their sin was great before the Lord, for they withdrew men from the Sacrifice of the Lord. And when they had thus violated His covenant demands in that manner, by that grave, persistent and willful sin, the Lord said the above. So also, imo, if Judas had wanted to be saved and receive that promise about the 12 thrones etc, he should have fulfilled the conditions required to obtain it, i.e. believed, persevered, repented etc.
God Bless