'Sir' in the Bible

Then Daniel (whose name is also Belteshazzar) was upset for a brief time; his thoughts were alarming him. The king said, "Belteshazzar, don't let the dream and its interpretation alarm you." But Belteshazzar replied, "Sir, if only the dream were for your enemies and its interpretation applied to your adversaries!

But suddenly someone who resembled a human being touched my lips, so addressing the one who was standing in front of me, I opened my mouth and said, "Sir, I'm overwhelmed with anguish by this vision. I have no strength left.

So how can a servant of my lord talk with someone like you, sir? And as for me, there's no strength left in me, and I can hardly breathe.'

and said, "Don't be afraid, man highly regarded. Be at peace, and be strong.' "As soon as he spoke to me, I gained strength and replied, "Sir, please speak, now that you've strengthened me.'

"I heard, but I didn't understand. So I asked, "Sir, what happens next?'