The story of Noah's Ark is one of the most famous stories in the Bible. According to the story, God instructed Noah to build an ark and to bring two of every kind of animal into the ark to save them from a great flood. But why did God allow clean and unclean animals into the ark? The answer lies in the concept of purification. In the Bible, certain animals are considered clean and others are considered unclean. Clean animals are those that are considered pure and suitable for sacrifice, while u…