Genesis 21:13
And also of the son of the bondwoman will I make a nation, because he is thy seed.
Cross-reference
Genesis 21:18
Parallel
Genesis 21:18 reaffirms the same promise about Ishmael becoming a great nation.
Genesis 17:20
Parallel
Genesis 17:20 details the blessing on Ishmael, directly supporting this promise.
Genesis 25:12–18
Prophetic fulfillment
Genesis 25:12-18 records Ishmael becoming twelve princes and a nation — the direct fulfillment of God's promise about Abraham's seed here.
Genesis 16:10
Parallel
In Genesis 16:10, God promised to multiply Hagar's descendants, echoing the promise here.