There appears to be secular reasons behind this view in some cultures as well: > In some areas, in order to preserve cleanliness where sanitation was an issue,

There appears to be secular reasons behind this view in some cultures as well: > In some areas, in order to preserve cleanliness where sanitation was an issue, the right hand, as the dominant hand of most individuals, was used for eating, handling food, and social interactions. The left hand would then be used for personal hygiene, specifically after urination and defecation. These rules were imposed on all, no matter their dominant hand. Through these practices, the left hand became known as the "unclean" hand. [1] [1] https://en.wikipedia.org/wiki/Bias_against_left-handed_people#Unfavorable_cultural_associations https://en.wikipedia.org/wiki/Bias_against_left-handed_peopl...