Final answer:
Peter and Andrew, the first disciples of Jesus, were fishermen. This is evidenced in the Bible, where Jesus performs a miracle by providing temple tax money found in a fish's mouth, highlighting Peter's fishing profession.
Step-by-step explanation:
The first disciples of Jesus, Peter and Andrew, were fishermen by profession. This detail from their lives is repeatedly referenced in the New Testament of the Bible, notably when Jesus first calls them to follow Him. One particular instance in the Gospel accounts is when a tax collector demands temple tax from Jesus and His disciples, and to provide for this, Jesus instructs Peter to find the necessary coin in the mouth of a fish he catches. This miracle, in which Jesus provides for the tax through a fish, reaffirms Peter's profession as a fisherman.