John 8:35

Verse 35. Now the servant abideth not in the house for ever, nor has a right to live in that manner as a son and a child of the family has to live in his father’s house. A slave or servant, though he live ever so long in his master’s house, his condition is quite different from that of a son of the family: and thus Christ puts them in mind that though they be of the race of Abraham, and in that sense can pretend to be his children, yet having made themselves slaves to sin, and remaining in that sin, by which they refuse to believe in him, their Messias, they are not the spiritual children of Abraham, nor can they inherit the promises made to Abraham, till, by the grace of Christ, they believe in him, and become his adoptive children. Witham.