Who is the first apostle in the Bible? While it seems that we first find apostles in the gospel accounts when Jesus selected his twelve, actually none of these are first.
The writer of Hebrews tells us to "fix your thoughts on Jesus, whom we acknowledge as our apostle and high priest." (Heb 3:1) Jesus is our first apostle. Jesus is selected as an apostle by His Father in Heaven, and sent to earth as God's representation, as God's ambassador, as God himself.