(3:33) Truly Allah *29 chose Adam and Noah and the descendants of Abraham and of 'Imran *30 above all mankind.
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(3:61) Tell whoever disputes with you on this matter after true knowledge has come to you: 'Come! Let us summon our sons and your sons, and our women and your women, and ourselves and yourselves, and then let us pray together and invoke the curse of Allah on those who lie.' *55
*55. The real aim in suggesting this procedure for deciding the dispute was to prove that the attitude of those amongst the delegation of Najran was one of deliberate stubbornness and intransigence. They had no sound arguments to contradict any of the points mentioned above, and they could not find any shred of evidence in their own scriptures upon which they could claim, with firm conviction, that their beliefs were true. Moreover, all that the members of the deputation had come to know of the character, teachings and achievements of the Prophet had made them more or less convinced of his prophethood, and at least caused their disbelief to waver. When they were told that if they had full confidence in the truth of their beliefs they should come forward and pray to God that His curse should fall on the deniers of the truth, none of them came forward. It thus became clear all over Arabia that the priests and leaders of Christianity in Najran, whose holiness was celebrated far and wide, followed beliefs, the truth of which, they themselves were not fully confident in.
*29. This marks the beginning of the second discourse. The period of its revelation is about 9 A.H., when a delegation from the Christian republic of Najran visited the Prophet. Najran lies between the Hijaz and Yaman, and comprised, at that time, seventy-three towns and villages. Its population can be gauged from the fact that an estimated one hundred and twenty thousand men could bear arms. The entire population was Christian and was under the hegemony of three Christian chiefs. The first of these, 'aqib, was the head of the community. The second, sayyid, looked after the collective and political affairs of the people. The third, usquf (bishop), was their religious leader. (See Ibn Hisham, vol. 1, p. 573; Ibn Ishaq, Life of Muhammad, tr. A. Guillaume, pp. 270 f. - Ed.)
http://www.turntoislam.com/forum/showthread.php?t=83070&page=2When the Prophet annexed Makka, the whole of Arabia became convinced that the future of the area was bound up with him, and deputations from all parts of the peninsula began to visit him. In this connection the three chiefs of Najran came to Madina accompanied by sixty people. As they were not prepared to go to war, the alternatives before them were either to embrace Islam or to live as dhimmis (protected non-Muslim subjects of the Islamic state). It was on this occasion that God revealed this discourse; it served as an invitation to the people of Najran to accept Islam.
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(3:61) Tell whoever disputes with you on this matter after true knowledge has come to you: 'Come! Let us summon our sons and your sons, and our women and your women, and ourselves and yourselves, and then let us pray together and invoke the curse of Allah on those who lie.' *55
*55. The real aim in suggesting this procedure for deciding the dispute was to prove that the attitude of those amongst the delegation of Najran was one of deliberate stubbornness and intransigence. They had no sound arguments to contradict any of the points mentioned above, and they could not find any shred of evidence in their own scriptures upon which they could claim, with firm conviction, that their beliefs were true. Moreover, all that the members of the deputation had come to know of the character, teachings and achievements of the Prophet had made them more or less convinced of his prophethood, and at least caused their disbelief to waver. When they were told that if they had full confidence in the truth of their beliefs they should come forward and pray to God that His curse should fall on the deniers of the truth, none of them came forward. It thus became clear all over Arabia that the priests and leaders of Christianity in Najran, whose holiness was celebrated far and wide, followed beliefs, the truth of which, they themselves were not fully confident in.