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

Verses

The devil is tied up.

2 Peter 2:4 View context

For if God spared not the angels that sinned, but cast [them] down to hell, and delivered [them] into chains of darkness, to be reserved unto judgment;

Jude 1:6 View context

And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day.

The devil is free to roam around.

Job 1:7 View context

And the LORD said unto Satan, Whence comest thou? Then Satan answered the LORD, and said, From going to and fro in the earth, and from walking up and down in it.

Job 2:2 View context

And the LORD said unto Satan, From whence comest thou? And Satan answered the LORD, and said, From going to and fro in the earth, and from walking up and down in it.

1 Peter 5:8 View context

Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour: