It is narrated from Sayyiduna Abu Tha'labah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Allah has laid down certain obligations, so do not neglect them; He has forbidden certain things, so do not violate them; He has set certain limits, so do not transgress them; and He has remained silent about certain things, not out of forgetfulness but deliberately, so do not dig into them."
Hadith Referenceالمعجم الكبير للطبراني / باب اللام ألف / 18809