Key Verses

1. 2:188Al-BaqarahWarning
   وَلَا تَأۡكُلُوٓاْ أَمۡوَٰلَكُم بَيۡنَكُم بِٱلۡبَٰطِلِ وَتُدۡلُواْ بِهَآ إِلَى ٱلۡحُكَّامِ لِتَأۡكُلُواْ فَرِيقٗا مِّنۡ أَمۡوَٰلِ ٱلنَّاسِ بِٱلۡإِثۡمِ وَأَنتُمۡ تَعۡلَمُونَ
   And eat not up your property among yourselves in vanity, nor seek by it to gain the hearing of the judges that ye may knowingly devour a portion of the property of others wrongfully.
   In context

   Do not take each other’s wealth unjustly: robbing it or taking it by force or by cheating, and then making it a legal dispute in order to obtain other’s wealth wrongfully, when you know that Allah has prohibited that. Committing a sin knowingly is the worst of things and has the greatest of punishments.