This Bible contradiction is from the Skeptic's Annotated Bible.

Verses

Be nice to them.

Deuteronomy 23:7 View context

Thou shalt not abhor an Edomite; for he [is] thy brother: thou shalt not abhor an Egyptian; because thou wast a stranger in his land.

Kill them.

2 Kings 14:3 View context

And he did [that which was] right in the sight of the LORD, yet not like David his father: he did according to all things as Joash his father did.

Ezekiel 25:13 View context

Therefore thus saith the Lord GOD; I will also stretch out mine hand upon Edom, and will cut off man and beast from it; and I will make it desolate from Teman; and they of Dedan shall fall by the sword.

Obadiah 1:1 View context

The vision of Obadiah. Thus saith the Lord GOD concerning Edom; We have heard a rumour from the LORD, and an ambassador is sent among the heathen, Arise ye, and let us rise up against her in battle.

Obadiah 1:8-9 View context

Shall I not in that day, saith the LORD, even destroy the wise [men] out of Edom, and understanding out of the mount of Esau?

And thy mighty [men], O Teman, shall be dismayed, to the end that every one of the mount of Esau may be cut off by slaughter.