One scripture that I have heard misquoted and preached out of context several times is
2 Peter 3:9
9The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.
I have heard it shortened and changed many times to "The Lord is not slack concerning his promises". Which of course, is true, but it is not what the verse is about since it's referring to the coming of the Lord.
I just heard that again this week and it was bugging me.