Simplify the following text for a Grade 11 native English-speaking person.
Original: The very earliest accounts of belief are contained in these texts , such as early Christian creeds and hymns , as well as accounts of the Passion , the empty tomb , and Resurrection appearances ; some of these are dated to the '30s or '40s , originating within the Jerusalem Church .
Simplified: The very earliest reports are in these texts : early Christian creeds and hymns and reports about the Passion , the empty tomb , and appearances of Jesus after his Resurrection .