–Judas is referred to as “elect.”(Gk,eklegomai - Strong’s word # 1586 – Lk 6:13, Jn 6:70; cf. Mk 13:20, Jn 13:18, 15:16,19, Acts 1:2), and then falls away and is damned.
–John 17:12 says “While I was with
them, I kept them in thy name, which thou hast given me; I have guarded
them, and none of **them **is lost
but the son of perdition, that the scripture might be fulfilled.” Notice the reference to Judas. Judas is in the same group given to Jesus by the Father.
Where does scripture tell us this? He could have put down deep roots into Christ and still turned from Christ just as Peter did with his denial.
Where does scripture make such a statement and what is the evidence? It seems to me that this is quite contrary to the scriptures because scripture describes Judas in the following ways:
–Judas was one of those that believed at the marriage feast of Cana[Jn 2:11]. Judas is present when Peter makes his public confession of faith and Jesus is revealed as the son of God[Matt 16:15-18].
–Like the rest of the twelve, Judas has healed the sick and cast out demons while preaching that the kingdom of heaven is at hand. Judas has done these things by the power of the Holy Spirit[Matt 6:8-13, Mark 3:14-19 and Mark 6:13].
–Judas was also present when Jesus gave the apostles as a group the “power to bind and loose” in Matthew 18:18. Judas believed and is one of the saved until he “betrayed” Jesus.
Where does scripture indicate such a thing? Why is it that such a thing should be assumed to be true? Judas spent three years being taught directly by our savior. Somehow I think he really knew Jesus quite well. A betrayer does not have to be ignorant; in fact, it makes more sense to be called a traitor if you do have knowledge of the one you betray.
Judas met all of the criteria under Protestant doctrine for salvation and OSAS. OSAS proponents universally argue salvation by faith alone. If that is the case, then OSAS is self contradictory in the case of Judas. Scripture explicitly tells us that Judas was a
"believer."
We find this explicit statement in In Matthew 14 where we are told that Jesus tells the disciples[that is the twelve] to get into the boat and to cross to the other side of the sea. Jesus then walks on the water and Peter joins him and begins to sink beneath the waves as his faith falters. Jesus then helps Peter stay afloat and then they both get back into the boat. Once in the boat scripture tells us the following:
Judas worshiped Jesus and declared his faith by stating that Jesus was truly the son of God. Judas was a
believer but he “became” a betrayer.[Luke 6:16]
Judas is never called a “false believer” a “believer without root” or any other such term. Judas
“became” a betrayer and thus the son of perdition*.
You make a strong case here, as always

This is definately the strongest argument to make against OSAS. And, I was convinced of this by you and others about a year ago.
However, I recently came across some OT prophesy around 6 weeks ago … that gave me some pause on this subject. Zechariah Chps 11 & 13 paint picture of Judas as a ‘worthless’ shepherd. Not a valued shepherd who suffered a brief lapse of faith.
Exegete for me Zechariah 11:7-17 & 13:7 … and show me where Judas is suggested as ever counted as a true sheep.