An Nawawi Hadith Number 30 : The Authority Of Jurthum bin Nashir
The messenger of Allah said : “Allah the Almighty has laid down religious duties, so do not neglict them. He has set boundaries, so do not over step them. He has prohibited some things, so do not violate them; about some things He was silent-out of compassion for you, not forgetfulness, so seek not after them.”
A fine hadith related by Al-Daraqutni and others.