'Servant's' in the Bible

What You have done so far was a little thing to You, Lord God, for You have also spoken about Your servant’s house in the distant future. And this is a revelation for mankind, Lord God.

Now, please bless Your servant’s house so that it will continue before You forever. For You, Lord God, have spoken, and with Your blessing Your servant’s house will be blessed forever.

“Now therefore, I’ve come to present this matter to my lord the king because the people have made me afraid. Your servant thought: I must speak to the king. Perhaps the king will grant his servant’s request.

and said to him, “My lord, don’t hold me guilty, and don’t remember your servant’s wrongdoing on the day my lord the king left Jerusalem. May the king not take it to heart.

David’s conscience troubled him after he had taken a census of the troops. He said to the Lord, “I have sinned greatly in what I’ve done. Now, Lord, because I’ve been very foolish, please take away Your servant’s guilt.”