Question: When there occurs a dispute between two people, some old men try to settle it down. If one of the disputers denies, he is to swear by one of the pious shaykhs. They take the Mus-haf (copy of the Qur’aan) and go to the grave. Some of the swearer’s relatives go with him to confirm the oath he takes. They believe that if that person does not tell the truth at the time he swears, he will be doomed.
Please inform us of the Sharee`ah ruling in this regard. It is also a common custom that if there arises a quarrel between people of one tribe, a person will reconcile between them. While making reconciliation, he orders one of the two parties to slaughter an animal and pay ten pounds until the other party becomes satisfied.
Answer: It is not permissible to swear by other than Allaah because many authentic pieces of evidence have been reported prohibiting it. Swearing by a pious shaykh falls under swearing by other than Allaah. Anyone in this habit should be advised and informed of its prohibition… read more here.