Contradiction with Genesis 15:18
This verse establishes God's promise to Abraham about giving his descendants the land from the river of Egypt to the Euphrates, which indicates a land grant rather than a transaction involving sheep and oxen as in Genesis 21:30.
Genesis 15:18: In the same day the LORD made a covenant with Abram, saying, Unto thy seed have I given this land, from the river of Egypt unto the great river, the river Euphrates:
Contradiction with Romans 4:13
This verse emphasizes that the promise to Abraham and his descendants was through the righteousness of faith, not through a covenant involving livestock as gifts, contrasting the idea of Genesis 21:30.
Romans 4:13: For the promise, that he should be the heir of the world, [was] not to Abraham, or to his seed, through the law, but through the righteousness of faith.
Contradiction with Galatians 3:18
This verse states that inheritance of the promise is not based on the law (or legal transactions), but on a promise, which contrasts with Genesis 21:30 where a legal covenant is symbolized through an exchange of animals.
Galatians 3:18: For if the inheritance [be] of the law, [it is] no more of promise: but God gave [it] to Abraham by promise.