Galatians 4:23 explains Isaac was born through promise, contrasting with Ishmael's fleshly birth — this clarifies the origin of children of promise.

Galatians 3:29 declares believers are Abraham's offspring and heirs according to promise — grounding the identity of children of promise.

Galatians 3:9 ties blessing to faith in Abraham, reinforcing that believers are children of promise by faith.

Romans 4:13-18 explains promise through faith, making believers heirs — expanding the basis for children of promise.

Romans 9:8 explicitly contrasts children of flesh and promise — directly reinforcing Paul's allegory here.

Romans 9:9 quotes the promise of Sarah's son — giving the specific scriptural basis for Isaac as child of promise.

Genesis 17:19 names Isaac as the son through whom covenant continues — the direct promise making him a child of promise.

In Genesis 21:1, God fulfills His promise to Sarah, grounding Paul's claim that believers are children of promise like Isaac.

Genesis 25:5 shows Isaac as sole heir, illustrating that believers, as children of promise, inherit the blessings.