And from Judæa.... and from Jerusalem. — The fact thus recorded is interesting as in some degree implying the ministry in Jerusalem and its neighbourhood, which the first three Gospels, for some reason or other, pass over.
Related Commentaries of Mark 3:7
Mark 3:7-8
7 But Jesus withdrew himself with his disciples to the sea: and a great multitude from Galilee followed him, and from Judaea,
8 And from Jerusalem, and from Idumaea, and from beyond Jordan; and they about Tyre and Sidon, a great multitude, when they had heard what great things he did, came unto him.