We're doing the binding spell from Hebron's Almanac?
―Willow Rosenberg[src]

A Binding spell was a kind of spell employed to contain a target, preventing it from doing harm to others and, in the case of magic users, also prevent them from performing spells. In cases of demons and portals, it would prevent reawakening and reopening, respectively. Hebron's Almanac contained a powerful binding spell capable of containing the Hellmouth Spawn.

Giles described the binding spell he planned to use on Acathla to be very difficult, and required creating a protective circle around the target and reciting something in Aramaic.

Known Binding Spells