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"O Prophet (Muhammad sal-Allaahu 'alayhe wa sallam)! Verily, We have made lawful to you your wives, to whom you have paid their Mahr (bridal money given by the husband to his wife at the time of marriage), and those (captives or slaves) whom your right hand possesses - whom Allaah has given to you, and the daughters of your 'Amm (paternal uncles) and the daughters of your 'Ammah (paternal aunts) and the daughters of your Khal (maternal uncles) and the daughters of your Khalah (maternal aunts) who migrated (from Makkah) with you, and a believing woman if she offers herself to the Prophet, and the Prophet wishes to marry her; a privilege for you only, not for the (rest of) the believers, Indeed We know what We have enjoined upon them about their wives and those (captives or slaves) whom their right hands possess, - in order that there should be no difficulty on you, And Allaah is Ever Oft-Forgiving, Most Merciful." [Al-Ahzaab (33):50]

Narrated Abu Huraira:

Allah's Apostle said, "If any one of you improve (follows strictly) his Islamic religion then his good deeds will be rewarded ten times to seven hundred times for each good deed and a bad deed will be recorded as it is." [The Book of Faith Volume 1, Book 2, Hadeeth 40]