«لَا أَبْتَغِي الْغَبْنَ وَلَا أَنْثَنِي / بِصَفْقَةِ الْمَغْبُونِ فِي حَسِّهِ»
I do not seek unfair loss, nor do I wish to leave a transaction as a person knowingly cheated.
Ghabn is loss through an unfair bargain; ṣafqa a bargain; maghbūn someone disadvantaged or deceived. The market imagery speaks about choices in relationships.
The two negatives balance not wronging another person with not knowingly accepting unfair treatment oneself. This balanced concern is central to the speaker's position.