'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 from his presence; but before the messenger came to him, he said to the elders, “Do you see how this son of a murderer has sent to take away my head? Look, when the messenger comes, shut the door and hold the door shut against him. Is not the sound of his master’s feet behind him?”

As Jehu entered the gate, she said, “Is it well, Zimri, your master’s murderer?”

“Now, when this letter comes to you, since your master’s sons are with you, as well as the chariots and horses and a fortified city and the weapons,

select the best and fittest of your master’s sons, and set him on his father’s throne, and fight for your master’s house.”

Then he wrote a letter to them a second time saying, “If you are on my side, and you will listen to my voice, take the heads of the men, your master’s sons, and come to me at Jezreel tomorrow about this time.” Now the king’s sons, seventy persons, were with the great men of the city, who were rearing them.

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