54 44519 Sunan an-Nasa'i 44 4503 The Book of Financial Transactions - كتاب البيوع "30367 20001 11014 18" "أخبرنا قتيبة بن سعيد، عن مالك، والليث، - واللفظ له - عن نافع، عن ابن عمر، عن النبي صلى الله عليه وسلم أنه قال "" لا يبيع أحدكم على بيع أخيه "" ." " It was narrated from Ibn 'Umar that the Prophet said: ""No one of you should urge someone to cancel a sale he has already agreed upon with his brother so as to sell him his won goods.'"