Cleric's Staff

Cleric's Staff is an enchanted quarter staff +3. This staff has a +3 bonus to damage, thaco and speed factor. Also, it raises the armor class of the wielder by 1. This item appears in Baldur's Gate II: Shadows of Amn. It can be used by all classes, but it requires a mimimal strength of 5 to wield it. It's not where this item can be gained, or how many there can be gained.

In-game description
"Cleric's Staff + 3: This simple staff radiates a powerful enchantment, though its plain design suggests a simple origin.  It reflects the quiet strength that faith brings, and was likely the modest weapon of a priest or cleric."