John Gill Commentary Mark 3:7

"And Jesus with his disciples withdrew to the sea: and a great multitude from Galilee followed; and from Judaea," — Mark 3:7 (ASV)

But Jesus withdrew himself with his disciples to the sea ,
&c.] Knowing their evil designs against him, he departed out of the synagogue, and city of Capernaum; and taking his disciples with him, he went to the shore of the sea of Galilee; not out of fear, but because his time was not yet come, and he had more work to do:

and a great multitude from Galilee :
from the several parts of it, in which country he now was:

and from Judea :
that part of the land of Israel, which was particularly so called, and belonged to the tribe of Judah.