Genesis 16:2

“And Sarai said unto Abram, behold now, the Lord hath restrained me from bearing, etc.] Or, “hath shut me up” f1034; that is, her womb, as were the wombs of the house of Abimelech, (<012018>Genesis 20:18); so that she could not conceive and bear children; she now at this age despaired of having children, perceiving very probably that it ceased to be with her after the manner of women; and this she refers to the will and power of God; for, as children are his gift, and an heritage from him, (<19C703>Psalm 127:3), so it is his will and pleasure sometimes to withhold this blessing from those who are very desirous of them: I pray thee go in unto my maid; Hagar, the Egyptian before mentioned; her…”

“- 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…”