MacGurcules |
DM_Blake |
(I personally have two hands)
It's in the Combat section, under Actions, Standard Actions, Cast Spell:
"To cast a spell with a somatic (S) component, you must gesture freely with at least one hand. You can't cast a spell of this type while bound, grappling, or with both your hands full or occupied."
edit: yep, I figured it was in the magic section too, but I only looked for one source. One source for one hand...