Like Cain, Achan had developed a bad heart. In Achan’s case, greed was a major factor, and it contributed to his becoming deceitful.
فَقَدْ نَمَّى ٱلْجَشَعَ ٱلَّذِي أَدَّى إِلَى صَيْرُورَتِهِ شَخْصًا مُخَادِعًا .‏