Three Demons. Monkey King, #12

The Chechi Kingdom suffered a severe drought. Although the monks chanted Buddhist sutra to pray for rain, not a single drop fell. Suddenly, three Taoist priests brought rain successfully. The king was overjoyed and made the three Taoist priests royal advisers. From that point on, they made Buddhist monks their slaves. An immortal appeared in the monks' dreams and told them to wait for the Great Sage Equal to Heaven's help.
When the monkey met the three priests, he tricked them and prevented them from bringing rain. He also won other challenges against them. When the three priests were killed in competitions, the king came to his senses and promised to respect Buddhist monks and Taoists equally and recruit based on talent.