Deuteronomy 18, 19, 20, & 21

Why were the Levites only to work as priests? How were they provided for? What does this have to do with tithing? Why is magic evil? Is there a righteous way to use it? If superpowers existed, what would separate them from magic and could they be used for good? What is magic and sorcery? Is talking to and raising the dead evil? Can a Christian get into astrology? How can we discern if a prophet is a false one? Why does God want Israel to not be like Canaan? What was the point of the cities of refuge? Why was the avenger of blood righteous to kill a murderer? Why does God require more than one witness to convict people of a crime? What is the point behind the eye for an eye and tooth for a tooth law? How was Israel to conduct war properly against other nations? How did this differ from how they should treat Canaan? How does God demand His people to treat the environment? How were unsolved murders to be atoned for? Why does the Bible forbid rape and how did this differ to how other nations treated women? Does God condone polygamy? Why was it okay for rebellious children to be killed? Why does God call a person hung up on a tree cursed and how does this involve Jesus?