This Bible contradiction is from the Skeptic's Annotated Bible.
2 Chronicles 7:14 View context
If my people, which are called by my name, shall humble themselves, and pray, and seek my face, and turn from their wicked ways; then will I hear from heaven, and will forgive their sin, and will heal their land.
Jeremiah 31:34 View context
And they shall teach no more every man his neighbour, and every man his brother, saying, Know the LORD: for they shall all know me, from the least of them unto the greatest of them, saith the LORD: for I will forgive their iniquity, and I will remember their sin no more.
1 John 1:9 View context
If we confess our sins, he is faithful and just to forgive us [our] sins, and to cleanse us from all unrighteousness.
Joshua 24:19 View context
And Joshua said unto the people, Ye cannot serve the LORD: for he [is] an holy God; he [is] a jealous God; he will not forgive your transgressions nor your sins.