Genesis 16:10

“And the angel of the Lord said unto her, etc.] The same as before, who, by what follows, appears to be Jehovah himself: I will multiply thy seed exceedingly; not that she should have many children herself, for that she had more than this one she now went with, is not certain; but that that seed she had conceived should be exceedingly multiplied, and he should have a numerous posterity, as he had twelve princes sprung from him, the heads of Arab nations: that it shall not be numbered for multitude; such the Turks are at this day, supposed to be the seed of Ishmael, Hagar’s son.”

“- The Birth of Ishmael 1. הנר hāgār, Hagar, “flight.” Hejrah, the flight of Muhammed. 7. מלאך mal'ak “messenger, angel.” A deputy commissioned to discharge a certain duty for the principal whom he represents. As the most usual task is that of bearing messages, commands, or tidings, he is commonly called a “messenger” ἄγγελος angelos). The word is therefore a term of office, and does not further distinguish the office-bearer than as an intelligent being. Hence, a מלאך mal'ak may be a man deputed by a man Genesis 32:3; Job 1:14, or by God Haggai 1:13; Malachi 3:1, or a superhuman being delegated in this case only by God. The English term “angel” is now especially appropriated to the latter…”

“16:10-12 Hagar’s son would become the father of a great but wild and hostile nation living in the Arabian Desert as perennial enemies of Israel (cp. 25:18). God blessed Ishmael as Abram’s descendant, but not as the line chosen to carry on the covenant. That blessing was reserved for Abram’s chosen heir.”