Sayyiduna Abu al-Darda (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "Whatever Allah Almighty has made lawful in His Book is lawful, whatever He has made unlawful is unlawful, and whatever He has remained silent about is a pardon. So accept from Allah Almighty the ease He has granted, for Allah Almighty does not forget anything." Then he (peace and blessings be upon him) recited this verse: "And your Lord is not forgetful."
Al-Bazzar and al-Tabarani in al-Mu'jam al-Kabir recorded it; its chain is hasan (good), and its narrators have been declared trustworthy.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب العلم / 794