California Code, Code of Civil Procedure - CCP § 567

(a) The receiver must be sworn to performthe duties faithfully.

(b) The receiver shall give an undertaking to the State of California, in such sum as the court or judge may direct, to the effect thatthe receiver will faithfully discharge the duties of receiver in the action and obey the orders of the court therein.The receiver shall be allowed the cost of the undertaking.