What is the accepted evidence for denying a partnership when the plaintiff fails to provide conclusive proof?

It relies on the denying party taking the decisive oath to deny the partnership, following the plaintiff's inability to provide clear and conclusive evidence to substantiate their claim of partnership. This is based on the Sharia legal maxim: "The burden of proof is on the claimant, and the oath is on the one who denies," and "The statement of the trustworthy person is accepted with their oath."