'Master's' in the Bible

But Elisha was sitting in his house, and the elders were sitting with him. Then the king sent a man from before him; 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? Behold, when the messenger comes, shut the door, and hold the door shut against him. Isn't the sound of his master's feet behind him?"

"Now as soon as this letter comes to you, since your master's sons are with you, and there are with you chariots and horses, a fortified city also, and armor.

Select the best and fittest of your master's sons, set him on his father's throne, and fight for your master's house."

Then he wrote a letter the second time to them, saying, "If you are on my side, and if you will listen to my voice, take the heads of the men your master's sons, and come to me to Jezreel by tomorrow this time." Now the king's sons, being seventy persons, were with the great men of the city, who brought them up.

How then can you turn away the face of one captain of the least of my master's servants, and put your trust on Egypt for chariots and for horsemen?