Contradiction with Deuteronomy 31:6
This verse speaks of God being with the Israelites and not forsaking them, while Genesis 48:21 speaks of God being with the people despite Jacob's impending death.
Deuteronomy 31:6: Be strong and of a good courage, fear not, nor be afraid of them: for the LORD thy God, he [it is] that doth go with thee; he will not fail thee, nor forsake thee.
Contradiction with Hebrews 13:5
This verse reassures that God will never leave nor forsake His followers, which seems consistent but can appear contradictory when considering Jacob's statement of his impending death in Genesis 48:21.
Hebrews 13:5: [Let your] conversation [be] without covetousness; [and be] content with such things as ye have: for he hath said, I will never leave thee, nor forsake thee.
Contradiction with Matthew 28:20
This verse promises that Jesus will be with His disciples always, which may seem to contradict the separation implied by Jacob's approaching death in Genesis 48:21.
Matthew 28:20: Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, [even] unto the end of the world. Amen.
Contradiction with Psalm 37:25
This verse reflects on never seeing the righteous forsaken, which is reassuring like Genesis 48:21, yet might be seen as conflicting in terms of Jacob's concern about his death.
Psalm 37:25: I have been young, and [now] am old; yet have I not seen the righteous forsaken, nor his seed begging bread.