"To be before the king" means to be one of his servants. Alternate translation: "The king of Israel sent one of his servants as a messenger" (See: [[rc://en/ta/man/translate/figs-idiom]])
Here Elisha is speaking to the elders right before the king's messenger arrived. Alternate translation: "when the messenger had almost arrived, Elisha said to the elders" (See: [[rc://en/ta/man/translate/figs-explicit]])
Elisha uses this rhetorical question to draw attention to the kings messenger and to insult the king. This can be written as a statement. Alternate translation: "See, this son of a murderer has sent someone to remove my head!" (See: [[rc://en/ta/man/translate/figs-rquestion]])
This means that the king of Israel has the characteristics of a murderer. Alternate translation: "this man who is like a murderer" or "that murderer" (See: [[rc://en/ta/man/translate/figs-idiom]])
If a door is shut against someone it means that it is closed and that they may not enter through it. Alternate translation: "hold the door shut so that he cannot come in" (See: [[rc://en/ta/man/translate/figs-idiom]])
Elisha uses this question to assure the elders that the king is coming not far behind him. This rhetorical question may be written as a statement. Alternate translation: "The sound of his master's feet is right behind him." or "The king will be coming along soon after he arrives." (See: [[rc://en/ta/man/translate/figs-rquestion]])