Principle: Money or good given to person by mistake must be returned to the person who gave them.
Factual Situation: Sunil and Burma jointly owed Rs.1000 to Siraj. Sunil pays the whole amount to Sirai in Suman's absence. Suman after returning from his vacations also paid full amount to Siraj not knowing the fact that Sunil had already paid the same. Is Siraj bound to repay or return the extra money to Suman that he obtained under mistake from her?