'Slave' in the Bible

The Lord was with Joseph, and he [even though a slave] became a successful and prosperous man; and he was in the house of his master, the Egyptian.

And the steward said, “Now let it be as you say; he with whom the cup is found will be my slave, but the rest of you shall be blameless.”

Now, therefore, please let your servant (Judah) remain here instead of the youth [to be] a slave to my lord, and let the young man go home with his brothers.