Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Please cite/link your sources, if possible. At some point in the next few days, I will:
Upvote all interesting answers.
Accept the best answer.
Go on to the next number.
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).