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"O you who believe! When believing women come to you as emigrants, examine them, Allaah knows best as to their Faith, then if you ascertain that they are true believers, send them not back to the disbelievers, they are not lawful (wives) for the disbelievers nor are the disbelievers lawful (husbands) for them, But give the disbelievers that (amount of money) which they have spent [as their Mahr] to them, And there will be no sin on you to marry them if you have paid their Mahr to them, Likewise hold not the disbelieving women as wives, and ask for (the return of) that which you have spent (as Mahr) and let them (the disbelievers, etc.) ask back for that which they have spent, That is the Judgement of Allaah, He judges between you, And Allaah is All-Knowing, All-Wise." [Al-Mumtahanah (60):10]

Narrated Abu Huraira:

The Prophet said, "Religion is very easy and whoever overburdens himself in his religion will not be able to continue in that way. So you should not be extremists, but try to be near to perfection and receive the good tidings that you will be rewarded; and gain strength by worshipping in the mornings, the nights." (See Fath-ul-Bari, Page 102, Vol 1). [The Book of Faith Volume 1, Book 2, Hadeeth 38]