what is the "3 call narrative" in the gospel of Mark?

Answer 1

Mark 1:20 - And straightway he called them: and they left their father Zebedee in the ship with the hired servants, and went after him.

Mark 2:17 - When Jesus heard it, he saith unto them, They that are whole have no need of the physician, but they that are sick: I came not to call the righteous, but sinners to repentance.

Mark 3:13 - And he goeth up into a mountain, and calleth unto him whom he would: and they came unto him.