بُلُوغُ الْمَرَامِ
Bulugh al-Maram 918
Business Transactions
وَعَنْ اِبْنِ عَبَّاسٍ -رَضِيَ اَللَّهُ عَنْهُمَا- قَالَ: قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -{ لَا ضَرَرَ وَلَا ضِرَارَ } رَوَاهُ أَحْمَدُ, وَابْنُ مَاجَهْ [1] .
Narrated [Ibn 'Abbas (RA)]: Allah's Messenger (ﷺ) said: "There should neither be harming (of others without cause), nor reciprocating harm (between two parties)." [Reported by Ahmad and Ibn Majah].
Sunnah.com reference: Book 7, Hadith 171