'Master's' in the Bible

Meanwhile, Elisha was sitting in his house, along with the elders, when the king sent a man to kill him, but before the messenger arrived, Elisha told the elders, "Are you watching how this descendant of murderers has ordered my head be cut off? Look, when the messenger arrives, shut the door and hold it to shut them out! Don't you hear the sound of his master's feet right behind him?"

As Jehu was coming out to his master's attendants, one of them asked him, "Is everything all right? Why did this maniac visit you?" "You know the man and how he speculates," Jehu replied.

"As soon as you receive this letter (since your master's children are with you, you have chariots and horses there with you, and you are protected by a walled city and weaponry),

select the best and most qualified of your master's sons, set him in place on his father's throne, and fight for your master's dynasty!"

But Jehu wrote them another letter: "If you're loyal to me, and if you intend to obey my commands, then bring the heads of your master's sons and meet me in Jezreel about this time tomorrow."

How can you refuse even one official from the least of my master's servants and rely on Egypt for chariots and horsemen?