This Bible contradiction is from the EvilBible.com.

Verses

A man may marry his brother's widow

Deuteronomy 25:5 View context

If brethren dwell together, and one of them die, and have no child, the wife of the dead shall not marry without unto a stranger: her husband's brother shall go in unto her, and take her to him to wife, and perform the duty of an husband's brother unto her.

A man may not marry his brother's widow

Leviticus 20:21 View context

And if a man shall take his brother's wife, it [is] an unclean thing: he hath uncovered his brother's nakedness; they shall be childless.