From Ibn 'Umar, that the Messenger of Allah ﷺ said: "Both the buyer and the seller retain the option as long as they have not separated or they give each other than option." He (Nafi') said: "So when Ibn 'Umar purchased something while he was sitting, he would stand to complete the sale."
سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ الْبَيِّعَانِ بِالْخِيَارِ مَا لَمْ يَتَفَرَّقَا أَوْ يَخْتَارَا قَالَ فَكَانَ ابْنُ عُمَرَ إِذَا ابْتَاعَ بَيْعًا وَهُوَ قَاعِدٌ قَامَ لِيَجِبَ لَهُ الْبَيْعُ
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