The Messiah's betrayer would be replaced by another.
OT Prophecy NT Fulfillment
Psalm 109:8
"Let his days be few; and let another take his office."
Acts 1:20–26
[20] For it is written in the book of Psalms, Let his habitation be desolate, and let no man dwell therein: and his bishoprick let another take.
[21] Wherefore of these men which have companied with us all the time that the Lord Jesus went in and out among us,
[22] Beginning from the baptism of John, unto that same day that he was taken up from us, must one be ordained to be a witness with us of his resurrection.
[23] And they appointed two, Joseph called Barsabas, who was surnamed Justus, and Matthias.
[24] And they prayed, and said, Thou, Lord, which knowest the hearts of all men, shew whether of these two thou hast chosen,
[25] That he may take part of this ministry and apostleship, from which Judas by transgression fell, that he might go to his own place.
[26] And they gave forth their lots; and the lot fell upon Matthias; and he was numbered with the eleven apostles.
Tanakh – Ketuvim – Psalms 109:8
"Let his days be few; let another take his charge."
Hebrew OT – Psalms 109:8
[109:8] יִהְיוּ יָמָיו מְעַטִּים
פְּקֻדָּתוֹ יִקַּח אַחֵר