Contradiction with Genesis 25:23
It contradicts Genesis 48:18 as it shows the younger son (Jacob) being favored over the older (Esau), whereas Genesis 48:18 describes a preference for the older son.
Genesis 25:23: And the LORD said unto her, Two nations [are] in thy womb, and two manner of people shall be separated from thy bowels; and [the one] people shall be stronger than [the other] people; and the elder shall serve the younger.
Contradiction with Matthew 20:16
This verse contradicts Genesis 48:18, as it emphasizes the last being first and the first being last, whereas Genesis 48:18 supports the precedence of the firstborn.
Matthew 20:16: So the last shall be first, and the first last: for many be called, but few chosen.
Contradiction with Romans 9:12-13
This passage contradicts Genesis 48:18 by highlighting God's choice of Jacob over Esau, the younger over the older, opposed to the favor of the firstborn in Genesis 48:18.
Romans 9:12-13: It was said unto her, The elder shall serve the younger. [elder: or, greater] [younger: or, lesser]
Contradiction with 1 Samuel 16:11-12
It contradicts Genesis 48:18 by narrating the anointing of David, the youngest son, over his older brothers, unlike the preference for the older in Genesis 48:18.
1 Samuel 16:11-12: And Samuel said unto Jesse, Are here all [thy] children? And he said, There remaineth yet the youngest, and, behold, he keepeth the sheep. And Samuel said unto Jesse, Send and fetch him: for we will not sit down till he come hither. [down: Heb. round]
Contradiction with Luke 15:11-32
The parable of the Prodigal Son contradicts Genesis 48:18 by depicting the father's celebration for the younger son, not the older, whereas Genesis 48:18 implies elder preference.
Luke 15:11-32: And he said, A certain man had two sons: