イサク vs イシュマエル

Isaac was the son of Abraham and Sarah, the second of the three great patriarchs of Israel, and the father of Jacob and Esau. His birth was miraculous, fulfilling God's covenant promise to the aged Abraham and Sarah (Genesis 21:1–7), and his near-sacrifice on Mount Moriah is one of the most theologically significant events in the Old Testament (Genesis 22). …

Ishmael was the firstborn son of Abraham, born to Hagar the Egyptian maidservant of Sarah (Genesis 16). When Sarah remained barren, she offered Hagar to Abraham as a surrogate; the resulting tension led to Hagar's temporary flight to the wilderness, where an angel promised her that Ishmael would become 'a great nation' (Genesis 16:10–12). After Isaac's birth, Sarah demanded the …