Is it permissible to settle the debts and obligations of a deceased father from the proceeds of an endowment (waqf) designated for the needy among his offspring and for sacrifices (adha), or must they be settled from the capital of the endowment itself?

Debts must be paid from the capital of the inheritance before its distribution. Debts are not paid from an executed waqf (endowment); rather, its revenue is spent on the needy among the endower's descendants, and sacrifices are made from it. What the deceased wrote as a will for his male children is an invalid will because it is a will to an heir, and it is not executed except with the approval of the remaining heirs, including the daughters.