ʿAbdullāh b. Saʿīd > ʿUqbah b. Khālid > ʿUbaydullāh > Nāfiʿ > Ibn ʿUmar

The Prophet ﷺ said: One of you must not ask a woman in marriage when his brother has done so already, and one of you must not sell (his own goods) when his brother has already sold (his goods) except with his permission. – Sound Chain

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ سَعِيدٍ حَدَّثَنَا عُقْبَةُ بْنُ خَالِدٍ عَنْ عُبَيْدِ اللَّهِ قَالَ حَدَّثَنِي نَافِعٌ عَنْ ابْنِ عُمَرَ

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «لَا يَخْطُبُ أَحَدُكُمْ عَلَى خِطْبَةِ أَخِيهِ وَلَا يَبِيعُ عَلَى بَيْعِ أَخِيهِ حَتَّى يَأْذَنَ لَهُ» – إسناده صحيح