Sayyiduna Abu Huraira (may Allah be pleased with him) narrates that the Prophet Muhammad (peace and blessings be upon him) said: "Whoever enters Paradise will be shown his place in Hell, that if he had done evil (he would have received this place), so that his gratitude may increase. And whoever enters Hell will be shown his place in Paradise, that if he had done good (he would have received this place), so that he may feel regret."