'Lord's' in the Bible

It happened that from the time that he made Joseph overseer in his house and [put him in charge] over all that he owned, that the Lord blessed the Egyptian’s house because of Joseph; so the Lord’s blessing was on everything that Potiphar owned, in the house and in the field.

With whomever of your servants your master’s cup is found, let him die, and the rest of us will be my lord’s slaves.”

So Judah said, “What can we say to my lord? What can we reply? Or how can we clear ourselves, since God has exposed the sin and guilt of your servants? Behold, we are my lord’s slaves, the rest of us as well as he with whom the cup is found.”