Abu Burdah bin Abi Musa narrated from his father that the Messenger of Allah said:
"Three will receive their reward twice: A slave who fulfills the rights of Allah and the rights of his owners, then he will be given his reward twice. And a man who has a beautiful slave girl, so he teaches her good manners, then he frees her, then he married her seeking the Face of Allah by that; then he will be given his reward twice. And a man who believed in an earlier Book, then another Book came to him and he believed in it; then he will be given his reward twice."
Reference: Jami` at-Tirmidhi 1116 In-book : Book 11, Hadith 38 English translation : Vol. 2, Book 6, Hadith 1116
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