American Tract Society Bible Dictionary
The third plague of Egypt, Exodus 8:16; Psalm 105:31; peculiarly offensive to the priests, who were obliged to shave and wash their entire body every third day, lest they should carry any vermin into the temples. According to many interpreters, lest they were the small stinging gnats which abound in Egypt.
These files are public domain and are a derivative of the topics are from American Tract Society Bible Dictionary published in 1859.
Rand, W. W. Entry for 'Lice'. American Tract Society Bible Dictionary. https://www.studylight.org/dictionaries/eng/ats/l/lice.html. 1859.