Shillelagh

This spell enables the caster to change his own oak cudgel or unshod staff into a magical weapon that gains a +1 bonus to its attack roll and inflicts 2d4 points of damage on opponents up to man size, and 1d4+1 points of damage on larger opponents. The spell inflicts no damage to the staff or cudgel. The caster must wield the shillelagh, of course.

The material components of this spell are a shamrock leaf and the caster's holy symbol.