Bartholomew

Bartholomew is one of the twelve apostles, yet he is known mostly by a name on a list. Matthew 10:3, Mark 3:18, Luke 6:14 and Acts 1:13 each name him, always next to Philip, and the Acts list places him among the believers gathered in an upper room after Jesus ascended. The Gospels record no words or deeds of his own. His place in the lists says something quiet but real: Jesus chose ordinary men, and the record keeps their names, including those about whom little else is told.

4 verses

Matthew

Matthew 10:3

Philip, and Bartholomew; Thomas, and Matthew the publican; James the son of Alphaeus, and Lebbaeus, whose surname was Thaddaeus;

Mark

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

Luke 6:14

Simon,(whom he also named Peter,) and Andrew his brother, James and John, Philip and Bartholomew,

Acts

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.

From Easton's Bible Dictionary

Matthew George Easton, 1897

Son of Tolmai, one of the twelve apostles (Matt. 10:3; Acts 1:13); generally supposed to have been the same as Nathanael. In the synoptic gospels Philip and Bartholomew are always mentioned together, while Nathanael is never mentioned; in the fourth gospel, on the other hand, Philip and Nathanael are similarly mentioned together, but nothing is said of Bartholomew. He was one of the disciples to whom our Lord appeared at the Sea of Tiberias after his resurrection (John 21:2). He was also a witness of the Ascension (Acts 1:4, 12, 13). He was an “Israelite indeed” (John 1:47).

From Smith's Bible Dictionary

William Smith, 1884

(son of Tolmai), one of the twelve apostles of Christ. (Matthew 10:3; Mark 3:18; Luke 6:14; Acts 1:13) It has been not improperly conjectured that he is identical with Nathanael. (John 1:45) ff. He is said to have preached the gospel in India, that is, probably, Arabia Felix, and according to some in Armenia.