Sahih Bukhari Volume 007, Book 062, Hadith Number 078.

Narrated By Anas : Abdur Rahman bin 'Auf married a woman and gave her gold equal to the weight of a date stone (as Mahr). When the Prophet noticed the signs of cheerfulness of the marriage (on his face) and asked him about it, he said, "I have married a woman and gave (her) gold equal to a date stone in weight (as Mahr)."

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