A proven right and a mere assertion of entitlement are not the same. A claim made through honest misunderstanding also differs from a deliberate fabrication.
Example 1: A student presents a certificate they never earned as their own: this is a false attribution.
Example 2: Heirs have a genuine dispute about entitlement and present evidence: disagreement alone does not establish intentional dishonesty.
Example 3: An employee bills for work never done: this may combine a false claim with an infringement of others’ rights.
مَا لَيْسَ لَهُ uses مَا in the sense “that which does not belong to him.”