Where precisely in the bible does it state that we will answer for every word we've ever said? Or be shown our sins? The dead know nothing, and those in heaven will not remember what they did here on earth..
Here's a couple that come to mind.
Matthew 12:36-37 But I tell you that every careless word that people speak, they shall give an accounting for it in the day of judgment. For by your words you will be justified, and by your words you will be condemned.”
Matthew 16:27 For the Son of Man is going to come in the glory of His Father with His angels, and will then repay every man according to his deeds.