An-Naish

وَمَنْ قَالَ لاَ يَجُوزُ ذَلِكَ الْبَيْعُ. وَقَالَ ابْنُ أَبِي أَوْفَى النَّاجِشُ آكِلُ رِبًا خَائِنٌ. وَهْوَ خِدَاعٌ بَاطِلٌ، لاَ يَحِلُّ. قَالَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «الْخَدِيعَةُ فِي النَّارِ، وَمَنْ عَمِلَ عَمَلاً لَيْسَ عَلَيْهِ أَمْرُنَا فَهْوَ رَدٌّ».Ibn Abi Awfa said, “One who practices Najsh is a Riba-eating traitor.” And such a practice is a false trick which is forbidden, and the Prophet ﷺ said, “Deception would lead to the Fire (Hell) and whoever does a deed which we have not ordered (anyone) to do (or is not in accord with our religion of Islamic Monotheism) then that deed will not be accepted."