ATH: " A Double Portion Of Allah's Mercy" Imam W. D. Mohammed(ra) Boston 1981

57: 28. O ye that believe! fear Allah and believe in His apostle and He will bestow on you a double portion of His Mercy: He will provide for you a light by which ye shall walk (straight in your path) and He will forgive you (your past): For Allah is Oft-Forgiving.  Most Merciful: 

7: 157. "Those who follow the apostle the unlettered prophet whom they find mentioned in their own (Scriptures); in the law and the Gospel; for he commands them what is just and forbids them what is evil: he allows them as lawful what is good (and pure) and prohibits them from what is bad (and impure); He releases them from their heavy burdens and from the yokes that are upon them.  So it is those who believe in him honor him help him and follow the light which is sent down with him it is they who will prosper."