'Servant's' in the Bible

This was a little thing to You, God, for You have spoken about Your servant’s house in the distant future. You regard me as a man of distinction, Lord God.

So now, You have been pleased to bless Your servant’s house that it may continue before You forever. For You, Lord, have blessed it, and it is blessed forever.

David said to God, “I have sinned greatly because I have done this thing. Now, please take away Your servant’s guilt, for I’ve been very foolish.”