Luke 5:4

Now when he had left speaking
Teaching the people, and preaching the word of God unto them out of the ship, as they stood on the shore before him.

He said unto Simon, launch out into the deep;
he spoke to Simon Peter, being the master of the vessel, to thrust it out, or put it off further into deep water, more convenient for fishing;

and let down your nets for a draught;
of fishes: his meaning is, that he would give orders to his servants, to put out the vessel to sea, to take their nets and cast them into the sea, in order to take and draw up a quantity of fish, which was their business.