نَهَى عَنِ الْمُحَاقَلَةِ وَالْمُزَابَنَةِ وَالْمُخَابَرَةِ وَعَنِ الثُّنْيَا إِلاَّ أَنْ تُعْلَمَ
It was narrated from Jabir that the Prophet forbade Al-Muhaqalah, Al-Muzabanah, Al-Mukhabarah and exceptions when selling, unless they were well-defined.