'Master's' in the Bible

Now Elisha was sitting in his house, and the elders were sitting with him. And the king sent a man ahead of him [to behead Elisha]; but before the messenger arrived, Elisha told the elders, “Do you see how this son of [Jezebel] a murderer has sent [a man] to remove my head? Look, when the messenger comes, shut the door and hold it securely against him. Is not the sound of his master’s feet [just] behind him?”

select the best and most capable of your master’s sons, and set him on his father’s throne, and fight for your master’s [royal] house.”

How then can you drive back even one official of the least of my master’s servants, when you rely on Egypt for chariots and horsemen?