דניאל ג:כו פירוש: רש״י

approached the gate of the... fiery furnace He approached the gate of the court, in which the furnace was situated, to speak with them, and at first, he saw them from afar.

Step out and come “step out and come,” but he did not say to them, “step out and ascend.” From here we learn that the floor of the furnace floated up and became even with the ground, so that they should not be troubled to go up.

Then...came out Although they were confident of the miracle that had been performed for them, they did not dare to treat the king lightly, to go out without permission.