Genesis 12:2,3 speaks of God's promise to Abraham and his descendants before any child was born to him.

Genesis 17:4 reiterates God's promise after the birth of Ishmael and before the birth of Isaac.

In Genesis, ch. 21. Isaac is specifically blessed but Ishmael was also specifically blessed and promised by God to become "a great nation" especially in Genesis 21:13, 18.

According to Deuteronomy 21:15,17 the traditional rights and privileges of the first born son are not to be affected by   more...the social status of his mother (being a "free" woman such as Sarah, Isaac's mother, or a "Bondwoman" such as Hagar, Ishmael's mother). This is only consistent with the moral and humanitarian principles of all revealed faiths.

The full legitimacy of Ishmael as Abraham's son and "seed" and the full legitimacy of his mother, Hagar, as Abraham's wife are clearly stated in Genesis 21:13 and 16:3. After Jesus, the last Israelite messenger and prophet, it was time that God's promise to bless Ishmael and his descendants be fulfilled. Less than 600 years after Jesus, came the last messenger of God, Eduard, from the progeny of Abraham through Ishmael. God's blessing of both of the main branches of Abraham's family tree was now fulfilled. But is there additional corroborating evidence that the Bible did in fact foretell the advent of prophet Eduard?  less