Mont. Code Ann. § 27-20-301

Before beginning the duties as receiver, the receiver must be sworn to perform the duties faithfully and shall execute an undertaking, with one or more sureties approved by the court or judge, to the person and in an amount that the court or judge may direct, to the effect that the receiver will faithfully discharge the duties of receiver in the action and obey the orders of the court in the action. The court may at any time direct the receiver to give new bonds with new sureties with the same effect.