Satan Missing

So far in the first few books of the Bible, I have found no references to Satan or to an afterlife. There was one instance where Moses called down some smiting on political dissidents in the camp and sent them "alive to Sheol". The earth opened up and swallowed the victims. I don't know if the use of Sheol in this instance was figurative or if Moses claimed that he was sending his adversaries to a place known as Sheol while still alive.