John 8:39
They answered and said unto him, Abraham is our father. Jesus saith unto them, If ye were Abraham's children, ye would do the works of Abraham — the authorities insist Abraham is their father. Jesus establishes the true criterion of spiritual parenthood: deeds, not genealogy. 'If ye were Abraham's children, ye would do the works of Abraham'—Abraham believed God and was faithful; the works of Abraham (faith, obedience, hospitality) would characterize his true children. The authorities claim descent but lack the faith and obedience that define Abraham's legacy.