“When Abram was 99 years old, the Lord appeared to him, saying, I am God Almighty. Live in My presence and be blameless. I will establish My covenant between Me and you, and I will multiply you greatly” (Genesis 17:1-2, ESV).
Thirteen years after Ishmael’s birth, God again appeared to Abram, whom He renamed as Abraham during this appearance. In these verses God calls Himself “El Shaddai,” for which the meaning is unknown, but its translation as “God Almighty” is based on a tradition going back more than two thousand years.