12 Now these are the records of the generations of Ishmael, Abraham’s son, whom Hagar the Egyptian, Sarah’s maid, bore to Abraham; 16 These are the sons of Ishmael; twelve princes according to their tribes. 18 They settled…. east of Egypt as one goes toward Assyria…in defiance of all his relatives.
Abraham had a momentary lapse of faith and decided to have a child by his maidservant Hagar. This child was Ishmael. There is a major contrast between Isaac and Ishmael in Genesis 25. Even though both are born of Abraham, Isaac is the child of promise and Ishmael is not. Isaac receives the blessing of God AA and Ishmael does not. God kept His promise to bless Ishmael and make him a great nation A but Ishmael made his own choice to reject the God Abraham and Isaac.
The spiritual blessing that God promised Abraham BB, that will ultimately be carried to all the nations through the ultimate child of promise, our Lord Jesus Christ, carries on through Isaac, not Ishmael. God says, “I will establish my covenant with Isaac” B.
God delivered on His promises concerning both Isaac and Ishmael.