5 And Abraham gave all that he had to Isaac. 6 But Abraham gave gifts to the sons of the concubines which Abraham had; and while he was still living he sent them eastward, away from Isaac his son, to the country of the east.
Israel must submit to the Word and Will of God and remove the Ishmaelites again, as they've proven necessary time and again.
Abraham's attempt at "peaceful coexistence" has been a miserable failure, represented by the likes of Shimon Peres and his criminal Kadima company for all the wrong reasons - unlike Abraham who meant well:
Shimon Peres has No Clothes: Where's the Peace?
Sarah's divine wisdom to expel Ishmael must be followed or Israel will suffer the consequences:
Daniel Pipes: Can the Leopard Change Its Spots?