16أُولٰئِكَ الَّذينَ اشتَرَوُا الضَّلالَةَ بِالهُدىٰ فَما رَبِحَت تِجارَتُهُم وَما كانوا مُهتَدينَAhmed & SamiraThose are those who bought/volunteered the misguidance with the guidance, so their commercial trade/buying and selling did not profit/gain, and they were not guided.