'Descendants Of Abraham' in the Bible

Neither, because they are the descendants of Abraham, are they all children: but, In Isaac shall your descendants be called.

I say then, Has God cast away his people? God forbid. For I also am an Israelite, of the descendants of Abraham, of the tribe of Benjamin.

Are they Hebrews? so am I. Are they Israelites? so am I. Are they the descendants of Abraham? so am I.

And verily they that are of the sons of Levi, who receive the office of the priesthood, have a commandment to take tithes of the people according to the law, that is, of their brethren, though they are descendants of Abraham: