What did Peter quote from the Psalms to support replacing Judas?
Peter quoted the Psalms saying, 'Let his habitation be desolate, let no man dwell therein,' and 'his bishopric let another take.' He used this to show the office as one of the twelve needed to be given to another, thereby supporting the selection of a replacement witness.
Les explains that Peter went back to the Book of Psalms, quoting, 'Let his habitation be desolate, let no man dwell therein,' and 'his bishopric let another take.' Les emphasizes that Judas's bishopric—his office as one of the twelve—was to be given to another. Peter then reasoned that from the men who had accompanied them from John's baptism until the day Jesus was taken up, one must be ordained to be a witness with them of His resurrection. Les also notes some teachers thought Peter was presumptuous, but he argues the qualifications required someone who followed Christ from John the Baptist through the Ascension, which Paul did not fit.