A.T. Robertson Commentary Mark 3:19

"and Judas Iscariot, who also betrayed him. And he cometh into a house." — Mark 3:19 (ASV)

He cometh into a house (ερχετα εις οικον). Historical present again and no article with noun. He comes home from the mountain, probably the house of Simon as in 1:29. Mark passes by the Sermon on the Mount given by Matthew and Luke on the mountain (plateau on the mountain in Luke). We have to allow a reasonable interval for Mark's narrative. Mark's Gospel is full of action and does not undertake to tell all that Jesus did and said.