(20) باب النَّهْىِ أَنْ يَخْطُبَ الرَّجُلُ عَلَى خِطْبَةِ أَخِيهِ .
It was narrated from Abu Hurairah that the Prophet said:
"None of you should propose marriage to a woman when someone else has already proposed to her." (PT)
Reference (PT): Sunan an-Nasa'i 3242 (PT)
In-book reference (PT): Book 26, Hadith 47 (PT)
English translation (PT): Vol. 4, Book 26, Hadith 3244 (PT)