Surah 57. Al-Hadid, Ayah 29

Lit., "so that the followers of earlier revelation [i.e., the Bible] may know".

I.e., that they have no exclusive claim to any of God's bounty - which latter term relates, in the present context, to a bestowal of divine revelation. This is addressed in the first instance to the Jews, who reject the revelation granted to Muhammad in the belief that the office of prophethood is an exclusive "preserve" of the children of Israel, as well as to the Christians who, as followers of the Bible, implicitly accept this unwarranted claim.

Let not any race, or people, or community, or group, believe that they have exclusive possession of Allah's Grace, or that they can influence its grant or its withholding. Allah's Grace is free, and entirely controlled by Him, independently of any priests and priviledged people. He dispenses it according to His own wise and holy Will and Plan; and to His Grace there is no limit. It is up to Him to bestow His Grace upon whom He likes. The Qur-an is the final revelation in which He said: "ye are the best Ummah brought forward to mankind." So in order to receive His Grace, one should submit to Islam.