الْبَيِّنَةُ عَلَى الْمُدَّعِي
The responsibility to present evidence belongs to the claimant.
A claim about someone else’s rights or conduct needs suitable support. A confident voice or repeating an accusation is not itself evidence. In وَالْيَمِينُ عَلَى الْمُدَّعَى عَلَيْهِ, the oath is connected to the party against whom the claim is made.
Example: a person states that they lent someone a book. This is a claim; a receipt, message, or witness may be relevant evidence. Final resolution depends on fuller facts and proper procedures.
الْيَمِينُ means “oath” here, not “right hand.” Context determines which meaning of a word is intended.