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The expression "every one of you" denotes the various communities of which mankind is composed. The term shir'ah (or shar'ah) signifies, literally, "the way to a watering-place" (from which men and animals derive the element indispensable to their life), and is used in the Qur'an to denote a system of law necessary for a community's social and spiritual welfare. The term minhaj, on the other hand, denotes an "open road", usually in an abstract sense: that is, "a way of life". The terms shir'ah and minhaj are more restricted in their meaning than the term din, which comprises not merely the laws relating to a particular religion but also the basic, unchanging spiritual truths which, according to the Qur'an, have been preached by every one of God's apostles, while the particular body of laws (shir'ah or shari'ah) promulgated through them, and the way of life (minhaj) recommended by them, varied in accordance with the exigencies of the time and of each community's cultural development. This "unity in diversity" is frequently stressed in the Qur'an (e.g., in the first sentence of 2:148 , in {21:92-93}, or in 23:52 ff.). Because of the universal applicability and textual incorruptibility of its teachings - as well as of the fact that the Prophet Muhammad is "the seal of all prophets", i.e., the last of them (see 33:40 ) - the Qur'an represents the culminating point of all revelation and offers the final, perfect way to spiritual fulfilment. This uniqueness of the Qur'anic message does not, however, preclude all adherents of earlier faiths from attaining to God's grace: for - as the Qur'an so often points out - those among them who believe uncompromisingly in the One God and the Day of Judgment (i.e., in individual moral responsibility) and live righteously "need have no fear, and neither shall they grieve".
I.e., "in order to test, by means of the various religious laws imposed on you, your willingness to surrender yourselves to God and to obey Him" (Zamakhshari, Razi), "and thus to enable you to grow, spiritually and socially, in accordance with the God-willed law of evolution" (Manar VI, 418 f.).
Lit., "inform you of that wherein you used to differ" (cf. surah {2}, note [94]). Thus, the Qur'an impresses upon all who believe in God - Muslims and non-Muslims alike - that the differences in their religious practices should make them "vie with one another in doing good works" rather than lose themselves in mutual hostility.
The participle muhaymin is derived from the quadriliteral verb haymana, "he watched [over a thing]" or "controlled [it]", and is used here to describe the Qur'an as the determinant factor in deciding what is genuine and what is false in the earlier scriptures (see Manar VI, 410 ff.).
Lit., "judge, then, between them...", etc. This apparently applies not merely to judicial cases but also to opinions as to what is right or wrong in the ethical sense (see note [55] above). As is evident from the mention of the "followers of the Gospel" in the preceding verse, and of the Torah in the earlier passages, the people spoken of here are both the Jews and the Christians.
After the corruption of the older revelations, the Qur-an comes with a twofold purpose: (1) to confirm the true and original Message, and (2) to guard it, or act as a check to its interpretation. The Arabic word Muhaimin is very comprehensive in meaning. It means one who safeguards, watches over, stands witness, preserves, and upholds. The Qur-an safeguards "the Book", for it has preserved within it the teachings of all the former Books. It watches over these Books in the sense that it will not let their true teachings to be lost. It supports and upholds these Books in the sense that it corroborates the Word of Allah which has remained intact in them. It stands a witness because it bears testimony to the Word of Allah contained in these Books and helps to sort it out from the interpretations and commentaries of the people which were mixed with it: what is confirmed by the Qur-an is the Word of Allah and what is against it is that of the people.
Law: shir'at = rules of practical conduct. Open Way: Minhaj = The guidance of the Prophet in all aspects of life.
By origin mankind were a single people or nation: iv. 1, and ii. 213. That being so Allah could have kept us all alike, with one language, one kind of disposition, and one set of physical conditions (including climate) to live in. But in His wisdom, He gives us diversity in these things, not only at any given time, but in different periods and ages. This tests our capacity for Unity (Wahdaniyat) still more, and accentuates the need of Unity and Islam.
Men are wont to make conflicting claims regarding Allah, the ultimate destiny of man, and other questions of vital importance. No matter how vehement and eloquent the proponents of false doctrines might be, their efforts will prove fruitless and it will be indisputably clear on the Day of Judgment as to who entertained false notions and who cherished the truth.