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I.e., regarding the true nature of Jesus. According to all the reliable authorities, verses {59-63} of this surah were revealed in the year 10 H., on the occasion of a dispute between the Prophet and a deputation of the Christians of Najran who, like all other Christians, maintained that Jesus was "the son of God" and, therefore, God incarnate. Although they refused the "trial through prayer" (mubahalah) proposed to them by the Prophet, the latter accorded to them a treaty guaranteeing all their civic rights and the free exercise of their religion.
In the year of Deputations, 10th of the Hijra, came a Christian embassy from Najran (towards Yaman, about 150 miles north of Sanaa). They were much impressed on hearing this passage of the Qur-an explaining thc true position of Christ, and they entered into tributary relations with the new Muslim State. But ingrained habits and customs prevented them from accepting Islam as a body. The Holy Prophet, firm in his faith, proposed a Mubahala, i.e., a solemn meeting, in which both sides should summon not only their men, but their women and children, earnestly pray to Allah, and invoke the curse of Allah on those who should lie. Those who had a pure and sincere faith would not hesitate. The Christians declined, and they were dismissed in a spirit of tolerance with a promise of protection from the State in return for tribute.