سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 3242
The Book of Marriage
Prohibition of Proposing Marriage To A Woman When Someone Else Has Already Proposed To Her
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا غُنْدَرٌ، عَنْ هِشَامٍ، عَنْ مُحَمَّدٍ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ لاَ يَخْطُبْ أَحَدُكُمْ عَلَى خِطْبَةِ أَخِيهِ .
It was narrated from Abu Hurairah that the Prophet (ﷺ) said: "None of you should propose marriage to a woman when someone else has already proposed to her."
Sunan an-Nasa'i, 3242sahih (Darussalam)