He was a tax collector:
Matthew 9:9 And as Jesus passed forth from thence, he saw a man, named Matthew, sitting at the receipt of custom: and he saith unto him, Follow me. And he arose, and followed him.
Mark 2:14 And as he passed by, he saw Levi the son of Alphaeus sitting at the receipt of custom, and said unto him, Follow me. And he arose and followed him.
Luke 5:27 And after these things he went forth, and saw a publican, named Levi, sitting at the receipt of custom: and he said unto him,Follow me.
Provides a feast at his house:
Luke 5:29 And Levi made him a great feast in his own house: and there was a great company of publicans and of others that sat down with them.
Named as one of the 12 apostles:
Matthew 10:3 Philip, and Bartholomew; Thomas, and Matthew the publican; James the son of Alphaeus, and Lebbaeus, whose surname was Thaddaeus;
Mark 3:18 And Andrew, and Philip, and Bartholomew, and Matthew, and Thomas, and James the son of Alphaeus, and Thaddaeus, and Simon the Canaanite,
Luke 6:15 Matthew and Thomas, James the son of Alphaeus, and Simon called Zelotes,
Last mentioned, after the ascension of the Lord, in the upper room:
Acts 1:13 And when they were come in, they went up into an upper room, where abode both Peter, and James, and John, and Andrew, Philip, and Thomas, Bartholomew, and Matthew, James the son of Alphaeus, and Simon Zelotes, and Judas the brother of James.