Sahih Muslim Book 30, Hadith Number 5820.

Chapter : Respect of Allah’s Messenger and abandoning of too many questions especially those for which there is no genuine need.

This hadith has been narrated by Abu Huraira through a different chain of transmitters (and the words are) that he reported Allah’s Messenger (may peace be upon him) having said: Abandon that which I have asked you to abandon, for the people before you went to their doom (for asking too many questions).