Is it obligatory to pay the debt of the deceased from his estate, even if his widow refuses that?

If the brother dies before the father, the brother does not inherit from the father's estate, nor does the brother's wife; because her husband originally has no share. And the deceased's relatives are not obligated to pay off his debt.

However, if the father dies first, then the brother, the brother has a share from his father's estate that transfers to his heirs. But his debt must be paid from his share before the distribution of the estate, because debt takes precedence over the rights of the heirs, as Allah Almighty says: "after any bequest he may have made or debt." Paying off the deceased's debt is a religious obligation to absolve his conscience, and "the soul of a believer is tied to his debt until it is paid off." If a dispute arises regarding the debt, the matter should be referred to the judiciary.