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Ye shall not add unto the word which I command you neither shall ye diminish ought from it. Deuteronomy 4:2
Trivia: What should you not do to your father's skirt, according to Deuteronomy 22:30?
"Corn" is obviously a mistranslation in the King James Version, since there was no corn in Egypt or anywhere in the Eastern hemisphere in biblical times.
Corn was domesticated 10,000 years ago by indigenous peoples in what is now Mexico.
See notes: Gen 41:49, Lev 2:14