'Master' in the Bible

Then Jonathan called out after the boy, "Quick, hurry, do not linger!" And Jonathan's servant collected the arrows and came to his master.

But a young man of the servants told Abigail, Nabal's wife, saying, "Look, David sent messengers from the desert to greet our master, but he addressed them angrily,

And so then, know and {consider} what you should do, for evil has been decided against our master and against all his household, and he [is such] {a wicked man}, {nobody can reason with him}!"

Then David said to him, "{To whom do you belong}, and from where [are] you? The young man said, "I am an Egyptian young man, a servant of an Amalekite man, but my master abandoned me because I became ill three days ago.