“Freed from sin, you have become slaves of righteousness.” One of the lessens of the Exodus was that the Hebrews would no longer be slaves to Pharoah. It was not that they would no longer be slaves period. At Sinai, they came to know that they should be slaves to One and only One, The Lord God. They were to be slaves to YHWH. Mary said in the Magnificat that she was the slave of the Lord. Paul is reminding us that we are to be slaves to righteousness, that we are meant to stay in right relationship to God through how we live as a new creation.