Contradiction with Deuteronomy 20:16
Contradicts by commanding the Israelites to leave no survivors, whereas Deuteronomy 2:26 describes sending peaceful messages.
Deuteronomy 20:16: But of the cities of these people, which the LORD thy God doth give thee [for] an inheritance, thou shalt save alive nothing that breatheth:
Contradiction with Matthew 5:44
Contradicts by urging love for enemies, whereas Deuteronomy 2:26 involved seeking peaceful passage through negotiation.
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;
Contradiction with Exodus 23:32
Contradicts by instructing not to make covenants with other nations, whereas Deuteronomy 2:26 involved seeking a form of agreement.
Exodus 23:32: Thou shalt make no covenant with them, nor with their gods.
Contradiction with 1 Samuel 15:3
Contradicts by commanding total destruction, whereas Deuteronomy 2:26 describes offering peace first.
1 Samuel 15:3: Now go and smite Amalek, and utterly destroy all that they have, and spare them not; but slay both man and woman, infant and suckling, ox and sheep, camel and ass.
Contradiction with Numbers 31:7
Contradicts by commanding the Israelites to go to war without offering peace, unlike Deuteronomy 2:26.
Numbers 31:7: And they warred against the Midianites, as the LORD commanded Moses; and they slew all the males.