'Slave' in the Bible

And she said, "May your female slave find favor in your sight." Then the woman went on her way and ate [something], and {her face did not look sad any longer}.

She got up, prostrated herself face down on the ground, and replied, "Your servant would be a slave to wash the feet of your majesty's servants."

Then David said to him, “Who do you belong to? Where are you from?”“I’m an Egyptian, the slave of an Amalekite man,” he said. “My master abandoned me when I got sick three days ago.

The Egyptian replied, "I'm a young Egyptian man, the slave of an Amalekite man. My master abandoned me, because I got sick three days ago. We raided the Negev of the Cherethites, the territory that belongs to Judah, and the Negev of Caleb, and we set Ziklag on fire."