Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates that the Prophet (peace and blessings be upon him) said: "Every condition that is not permitted in the Book of Allah will be counted void, even if it were a hundred conditions."
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب البيوع / 6393
Hadith Gradingمحدثین:إسناده صحیح
Hadith Takhrij«اخرجه البزار فى المسند (1295) ، أخرجه المعجم الكبير للطبراني برقم: 10869»