John 8:33-37

They answered him, "We are Abraham's descendants and have never been slaves of anyone. How can you say that we shall be set free?" Jesus replied, "Very truly I tell you, everyone who sins is a slave to sin. Now a slave has no permanent place in the family, but a son belongs to it forever. So if the Son sets you free, you will be free indeed. I know that you are Abraham's descendants. Yet you are looking for a way to kill me, because you have no room for my word."

We are Abraham's descendants 
John 8:39-40  "Abraham is our father," they answered. "If you were Abraham's children," said Jesus, "then you would do what Abraham did. As it is, you are looking for a way to kill me, a man who has told you the truth I heard from God. Abraham did not do such things."
Luke 3:8  "Produce fruit in keeping with repentance. And do not begin to say to yourselves, 'We have Abraham as our father.' For I tell you that out of these stones God can raise up children for Abraham."

everyone who sins is a slave to sin 
Romans 6:16  Don't you know that when you offer yourselves to someone as obedient slaves, you are slaves of the one you obey--whether you are slaves to sin, which leads to death, or to obedience, which leads to righteousness?

Now a slave has no permanent place in the family, but a son belongs to it forever 
Galatians 4:30  But what does Scripture say? "Get rid of the slave woman and her son, for the slave woman's son will never share in the inheritance with the free woman's son." (Genesis 21:10)
 
So if the Son sets you free, you will be free indeed 
John 8:32  "Then you will know the truth, and the truth will set you free."
Revelation 1:5  ... and from Jesus Christ, who is the faithful witness, the firstborn from the dead, and the ruler of the kings of the earth. To him who loves us and has freed us from our sins by his blood, ... 

(parentheses are mine)

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