The attached painting is Michelangelo Buonarroti’s, Last Judgement. What is/was the source of inspiration for this famous painting? What does the painting depict?

The source of the attached painting of Michelangelo Buonarroti’s, Last Judgement is in the book of revelations in the bible. The painting depicts the Second Coming of Christ and the final judgement by God for all human souls. The soul of humans rise and descend to their fates as judged by Christ surrounded by known saints.