I had borrowed a sum of money from my maternal aunt's husband, my uncle, five months before his death, and he had written a note of his debts. I remember borrowing 6,000 Qatari Riyals and repaying 3,500 Riyals of it, but the amount mentioned in the note is 10,000 Riyals. I do not recall borrowing any other amount, so what should I do?

Summary: It is permissible to swear an oath based on strong presumption or strong circumstantial evidence, but it is forbidden to swear an oath based on weak circumstantial evidence, such as doubt. In the case where the debtor admits the debt but they differ on the amount, the statement of the creditor is accepted along with his oath. If the creditor dies, the right to swear the oath transfers to his heirs if there is a document in the handwriting of their deceased relative proving the debt. If the heirs swear the oath, the debtor is obliged to pay. If they do not swear the oath and do not reach a settlement, the debtor swears an oath on the amount he admits.