Who knows eighty-three?
Please cite/link your sources, if possible. At some point in the next few days, I will:
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83 sections of halachos in the Rambam's Yad.
The Scriptural term מחלה (illness), which the Gemara defines as pathology of the gall bladder or bile, has 83 sicknesses associated with it, equivalent to the gematria of the word מחלה. (Bava Kama 92b and elsewhere)
83 was Aharon's age when he and Moshe first confronted Pharaoh (Ex. 7:7).