Answer
According to Ibn Khaldun, the Qur’an and Sunnah are the only acceptable constitution for Muslims because they are the only sources of law that are divinely ordained. He argued that other sources of law, such as human reason and custom, are not as reliable because they are subject to error. The Qur’an and Sunnah, on the other hand, are infallible and therefore provide a more reliable basis for law.