Tell him that Paul was assigned to the Gentiles. I said that very thing. However, nobody has quoted one verse that even hints at Paul being the replacement of Judas.
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According to God's word, there are only twelve apostles for the Church age.
There were three gates on the east, three on the north, three on the south and three on the west.
The wall of the city had twelve foundations, and on them were the names of the twelve apostles of the Lamb.
Revelation 21:13-14