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"O people of the Scripture (Jews and Christians)! Do not exceed the limits in your religion, nor say of Allaah aught but the truth, The Messiah 'Eesaa (Jesus), son of Maryam (Mary), was (no more than) a Messenger of Allaah and His Word, ("Be!" - and he was) which He bestowed on Maryam (Mary) and a spirit (Ruh) created by Him; so believe in Allaah and His Messengers, Say not: "Three (trinity)!" Cease! (it is) better for you, For Allaah is (the only) One Ilaah (God), Glory be to Him (Far Exalted is He) above having a son, To Him belongs all that is in the heavens and all that is in the earth, And Allaah is All-Sufficient as a Disposer of affairs." [An-Nisaa' (4):171]

Narrated 'Umar bin Al-Khattab:

Once a Jew said to me, "O the chief of believers! There is a verse in your Holy Book Which is read by all of you (Muslims), and had it been revealed to us, we would have taken that day (on which it was revealed as a day of celebration." 'Umar bin Al-Khattab asked, "Which is that verse?" The Jew replied, "This day I have perfected your religion For you, completed My favor upon you, And have chosen for you Islam as your religion." (5:3) 'Umar replied,"No doubt, we know when and where this verse was revealed to the Prophet. It was Friday and the Prophet was standing at 'Arafat (i.e. the Day of Hajj)" [The Book of Faith Volume 1, Book 2, Hadeeth 43]