Luke 3:8

Not to say-We have Abraham to our father; rely no more for salvation on your outward relation to Abraham.

Of these stones-children unto Abraham; he who formed Adam out of the dust of the earth in his own image, can of these stones raise up holy men, who shall be Abraham's children, not by fleshly descent, but by having the character and doing the works of Abraham. Compare John 8:39; Galatians 3:7. This is a clear intimation that the time has come when Abraham's seed shall no longer be reckoned by outward descent, but by character.