Arguments from the Quran and Hadith

Al-Khazin (d. 1341 C.E.) wrote: Here, iqamat-e deen refers to the oneness of God, and faith in God and His books and the prophets and the Last Day and obeying God in matters of His commandments and prohibitions and doing all those things the performing of which makes a person a Muslim. In this context, deen does not connote the shariahs that are revealed according to the conditions and interests of different communities because, as the Quran clarifies, these are different. Al-Alusi al-Baghdadi (d. 1854 C.E.) commented about the term iqamat-e deen as used in this context as follows: The deen of Islam is the name for the oneness of God, obedience to God, and faith in His books, His prophets and the Day of Recompense and all those things on the basis of which a person becomes a true believer (momin). By iqamat-e deen is meant to properly follow the affairs of the deen and to remain established in it. Qumi Nishapuri (d. 1328 C.E.) opined that the phrase iqamat-e deen as used here means: To be established on the oneness of God, prophethood and the Hereafter and to follow other similar basic teachings that are other than those minor legal details (furuʿat) that are different in the different shariahs. Likewise, al-Qurtubi (d. 1273 C.E.) noted: