“The ones who judge not by what God has brought down...
“The ones who judge not by what God has brought down, these are the sinful” (Qur'an 5:50 “al-Ma 'idah”); “The ones who judge not by what God has brought down, these are the iniquitous” (Qur'an 5:48 “al-Ma'idah”); “The ones who judge not by what God has brought down, these are the unbelievers” (Qur'an 5:47 “al-Ma'idah”). Our was called on to turn the leaf on sinfulness, iniquity and unbelief.
Therefore, in the logic of the Qur'an, the failure to refer to its provisions brought down by God means appealing to a false god.[^5] If referring to the provisions of the Qur'an has been Divinely ordained, being the Will of the Lord; if this demands obtaining God's judgement as revealed in the Qur'an; then there must presumably be a person both qualified and fully prepared to carry out this Divine Command.
There can be no one else but the Prophet, or someone “of him” to discharge and to impart it in his place[^6] - someone qualified like himself and prepared for the task. (ii) Strong, longstanding disagreement has existed among scholars -especially in areas that are of importance to people and to their lives - for no other reason than a lack of grasp of the Qur'an.
Imam `Ali referred to this issue when he disparaged similar disagreement while the Qur'an was there in their midst: A case goes before one of them for judgement; so he passes judgement based on hts opinion. The very same case goes before another, who judges differently from the first. Thereupon the judges gather before the leader who appointed them He approves all of their options - although their Lord is One and their Prophet is One and their Book is One!
Has God really commanded them thus to disagree, and so they merely obey? or did He command them against it, and they now disobey? Has God revealed a deficient religion fox whose perfection He seeks their assistance? Are they His partners, that they need only pronounce themselves and He to give His consent? Or has God brought down a perfect religion, but the Prophet failed to convey or to achieve it? Yet God says: “...nothing have we omitted from the Book” (Qur an 6:38 “al An`am”)...
We have sent down the Book to you explaining every manner of thing - a Guidance and a Mercy...” (Qur an 16:89 “al-Nahl”) He also recalls that each part of the Book confirms the other, that the Qur'an has no discrepancies; “Were it from anyone but God, they would surely have found many discrepancies” (Qur'an 4:82 “al-Nisa”).