Commentaries:
Robertson's Word Pictures (NT)
Sat in the sea (kaqhsqai en th qalassh). In the boat, of course, which was in the sea. He first sat by the beach (Matthew 13:1) and then a very great multitude (oxlov pleistov) made him enter a boat in which he sat and taught. It was a common experience now to teach the crowds on the beach (Mark 2:1, Mark 2:13; Mark 3:7-9).
There is gathered (sunagetai). Graphic pictorial present again. See the crowds pressing Jesus into the sea.
Other Robertson's Word Pictures (NT) entries containing Mark 4:1:
Luke 4:20
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