Leviticus 25:42
For they are my servants whom I took out from the land of Egypt; they may not become the property of another.
Leviticus 25:55
For the children of Israel are servants to me; they are my servants whom I took out of the land of Egypt: I am the Lord your God.
Romans 6:22
But now, being free from sin, and having been made servants to God, you have your fruit in that which is holy, and the end is eternal life.
1 Corinthians 7:21-23
If you were a servant when you became a Christian, let it not be a grief to you; but if you have a chance to become free, make use of it.