Contradiction with Joshua 1:9
This verse encourages strength and courage, whereas Deuteronomy 27:11 addresses the instruction of blessings and curses without reference to personal fortitude.
Joshua 1:9: Have not I commanded thee? Be strong and of a good courage; be not afraid, neither be thou dismayed: for the LORD thy God [is] with thee whithersoever thou goest.
Contradiction with Romans 12:14
It instructs to bless those who persecute, which contrasts with the focus on curses associated with the commands in Deuteronomy 27:11.
Romans 12:14: Bless them which persecute you: bless, and curse not.
Contradiction with Matthew 5:44
This verse advocates loving enemies and blessing those who curse you, conflicting with the imposition of curses in Deuteronomy 27:11.
Matthew 5:44: But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;