Devil's in the detail proverb
The phrase describes some minor details that can cause many unexpected difficulties or problems
As an accountant, I always double check everything as the devil is in the details.
He often ignores small details and doesn't know that the devil is in the details.
The first version of the expression was “God is in the details". It meant that you do not focus on doing something. "The devil is in the details" is a variation of the first version.A source said that "The devil is in the detail" appeared in the 1800s.