# The king sent a man from before him

"The king of Israel sent one of his servants as a messenger" 

# when the messenger came to Elisha, he said to the elders

"when the messenger had almost arrived, Elisha said to the elders" 

# See how this son of a murderer has sent to take away my head?

"See, this man who is like a murderer has sent someone to remove my head!" 

# to take away my head

"to cut off my head" or "to behead me" 

# Look, when

"Listen to what I want you to do: when"

# hold the door shut against him

"hold the door shut so that he cannot come in" 

# Is not the sound of his master's feet behind him?

"The sound of his master's feet is right behind him." or "The king will be coming along soon after he arrives."