Contradiction with Genesis 17:19
This verse specifies that God's covenant will be established with Isaac, contradicting Genesis 21:13 where God promises to make a nation of Ishmael.
Genesis 17:19: And God said, Sarah thy wife shall bear thee a son indeed; and thou shalt call his name Isaac: and I will establish my covenant with him for an everlasting covenant, [and] with his seed after him.
Contradiction with Genesis 22:2
God commands Abraham to offer Isaac as a sacrifice, indicating Isaac's unique role, contrary to the national promise for Ishmael in Genesis 21:13.
Genesis 22:2: And he said, Take now thy son, thine only [son] Isaac, whom thou lovest, and get thee into the land of Moriah; and offer him there for a burnt offering upon one of the mountains which I will tell thee of.
Contradiction with Romans 9:7
This verse states that not all descendants of Abraham are considered as the true children, which contradicts the notion of making a nation out of Ishmael in Genesis 21:13.
Romans 9:7: Neither, because they are the seed of Abraham, [are they] all children: but, In Isaac shall thy seed be called.
Contradiction with Galatians 4:22
Suggests a division between the child of the promise (Isaac) and the child of the bondwoman (Ishmael), which contradicts the promise of making a nation out of Ishmael as seen in Genesis 21:13.
Galatians 4:22: For it is written, that Abraham had two sons, the one by a bondmaid, the other by a freewoman.
Paradox #1
Genesis 21:13 presents a situation where God promises to make a nation out of Ishmael, even though he is being sent away from his father's household. The contradiction might be seen in the context of fairness and favoritism, as Ishmael's situation stems from complicated family dynamics and favoritism towards Isaac. Some might question the fairness of sending Ishmael away while still receiving a blessing.