This Bible contradiction is from the Skeptic's Annotated Bible.
God's anger lasts for just a moment.
Psalm 30:5 View context
For his anger [endureth but] a moment; in his favour [is] life: weeping may endure for a night, but joy [cometh] in the morning.
God's anger lasts a long time.
Numbers 32:13 View context
And the LORD'S anger was kindled against Israel, and he made them wander in the wilderness forty years, until all the generation, that had done evil in the sight of the LORD, was consumed.
God's anger doesn't last forever.
Jeremiah 3:12 View context
Go and proclaim these words toward the north, and say, Return, thou backsliding Israel, saith the LORD; [and] I will not cause mine anger to fall upon you: for I [am] merciful, saith the LORD, [and] I will not keep [anger] for ever.
God's anger lasts forever.
Jeremiah 17:4 View context
And thou, even thyself, shalt discontinue from thine heritage that I gave thee; and I will cause thee to serve thine enemies in the land which thou knowest not: for ye have kindled a fire in mine anger, [which] shall burn for ever.
Malachi 1:4 View context
Whereas Edom saith, We are impoverished, but we will return and build the desolate places; thus saith the LORD of hosts, They shall build, but I will throw down; and they shall call them, The border of wickedness, and, The people against whom the LORD hath indignation for ever.
Matthew 25:41 View context
Then shall he say also unto them on the left hand, Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels:
Matthew 25:46 View context
And these shall go away into everlasting punishment: but the righteous into life eternal.