Nathanael, Philip, and Bartholomew in John 1
The Bible never calls Nathanael Bartholomew. John 1:45–51 shows a friend bringing a skeptical man to Jesus, who knows him before they meet and promises a greater revelation still to come.
Nathanael in John 1: Is He Bartholomew?
John 1:43–51 gives us Philip's invitation, Nathanael's honest doubt, and Jesus naming a man he had never met. The name Bartholomew appears nowhere in it, which is why the link between the two rests on comparing the Gospel lists.