Genesis 25:9

And his sons Isaac and Ishmael buried him in the cave of Machpelah, which is before Mamre, in the field of Ephron the son of Zohar the Hittite, (Genesis 25:9 NKJV)

Isaac and Ishmael got together to bury their father. Although the previous verse says that he gave all to Isaac, Ishmael did the duty of the firstborn along with Isaac. Notice that Abraham's other children are not mentioned. They were sent away, as is Ishmael, but Ishmael came back. Could it be that his descendants will return? Pray for the Arabs, the descendants of Ishmael, that they might come back and join us like Ishmael joined Isaac. We also know that God is The Lord of the living and not the dead, since Abraham, who dies here is alive and comforting Lazarus in Luke 16.