Yahya related to me from Malik from Muhammad ibn Yahya ibn Habbanfrom al-Araj from Abu Hurayra that the Messenger of Allah, may Allahbless him and grant him peace, said, "Do not ask for a woman inmarriage when another muslim has already done so."
USC-MSA web (English) reference: Book 28, Hadith 1
Arabic reference: Book 28, Hadith 1094