Where in the bible does it say that Mary went to heaven?
It doesn't say that anywhere in the Bible
Where to find in the bible that the one of the two thieves hung on the cross with Jesus went to hell?
As the Scriptures themselves tell us, not everything is written down, and the New Testament was not written until many years after Our Blessed Lord's Ascension into heaven, nor formed, as we have it today, until centuries later. The Bible, specifically the New Testament, was written as a preaching tool, NOT as a compendium of Christian doctrine. No dogma may contradict Scripture, but it is not all contained in Scripture, that is a protestant heresy.