َ عَنْ أَبِي عَبْدِ اللَّهِ ع قَالَ: كَسْبُ الْحَرَامِ يَبِينُ فِي الذُّرِّيَّةِ.
Wasa’il al-Shi‘a, vol. 17, p. 82
A pure spirit is breathed into a pure substance, and an impure spirit into an impure one. A person’s body and soul, character and actions provide a setting for the presence and influence of spirits suited to them—within their physical and mental space, the very particles of their being, their blood and, likewise, their seed.
The harmful effects of earning through forbidden means are not confined to one’s seed; they also affect a person’s constitution, becoming visible in their outward appearance.
Nor is it always the case that people of low and vile character are the result of their parents’ ill-gotten gains. Other factors may well shape a person’s character, including their own actions.
A tendency toward baseness, an insatiable appetite for sin, and transgression are among the signs of the effects of consuming what is unlawfully acquired.