TSR2159 - Appendix 4
Following the name of each priest spell, a magical school is given in parentheses. This is for reference purposes only. For instance, Wisdom bonuses apply to saving throws vs. enchantment/charm spells. If the appropriate magical school were not listed with priest spells, it would be hard to figure out which spells were considered to be enchantment/charms. There are a few other reasons one might need to know this information. The priest spells are not really organized into magical schools, but rather into spheres of influence, as described in Chapter 3 - Player Character Classes and Chapter 7 - Magic.