The Holy Qur'an says...

The Holy Qur'an says, if a person fears that the testator is [wrongfully] inclined [to one party] or is sinning [by depriving the rightful heir in the Will, and so that person intervenes between the testator and the potential heirs] and makes peace between them—then there is no sin on him. All… is Forgiving, Merciful. (2:182) What has been described in this verse as wrongfully "inclining to one party" and "sinning by depriving the rightful heir" is related to the two-thirds of the estate.

The one-third will be assessed after taking those expenditures, which are incumbent upon the whole estate, like funeral expenses, and the legal or religious debts. Monetary obligations (Religious or Legal)