Bill requiring a debtor to hunt for assets for repayment of his debt: Bava Metzia 16b
Writing such a bill for a lender, if the borrower replies to the court's order to pay by saying that he had paid, but doesn't swear: Bava Metzia 16b-17a
Above, where the borrower is replying to the court's statement of his debt instead of an order to pay: Bava Metzia 17a