Sayyiduna Hudhayfah (may Allah be pleased with him) said: Three types of people can give fatwa: the Imam, or the ruler of the government, or the person who is knowledgeable about the abrogating and abrogated verses of the Qur'an. The people asked: Who can such a person be? He said: Either Sayyiduna Umar ibn al-Khattab (may Allah be pleased with him), or a foolish ignoramus who takes it upon himself.