The first revelation of Allah through the angel Gabriel to Muhammad [PBUH] was the word "Iqra" which means "Read" in Surah 96:1-5.  As he was illiterate he replied: "I cannot read." This first revelation was prophesied in Isaiah 29:12: "And the book is delivered to him that is not learned, saying, Read this, I pray thee and he saith, I am not learned."

The order of the revelations is not as the order it is seen in the Quran.  In other words the first part revealed is not in the first page and the last part revealed is not in the last page.  That these revelations came in installments and inserted in certain order in the Quran as ordained by Allah, was also mentioned in Isaiah 28:10-11: "For precept must be upon precept, precept upon precept; line upon line, line upon line; here a little, and there a little: For with stammering lips and another tongue will he speak to his people." Another tongue means here another language, not Hebrew or Aramaic but Arabic.

Muslims all over the world are using one language, which is Arabic, in calling their God, in their prayers, pilgrimage and in their greetings to each other.  Also this unity of language had been prophesied in Zephaniah 3:9: "For then will I turn to the people a pure language, that they may all call upon the name of the Lord, to serve him with one consent.." Alas the Truth has come in Arabic, but some still expect Prophet Jesus [PBUH], who might reach mankind to worship Allah in one unique language in his second coming.  We Muslims are sure that Prophet Jesus in his second coming will join the Muslims in their mosques as he is like any other Muslim, circumcised, not eating pork, and performing prayers with ablution, standing, bowing and prostration.