Sahih Bukhari Volume 005, Book 059, Hadith Number 435.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 59. Military Expeditions Led by the Prophet (PBUH) (Al-Maghaazi)
Narrated By Sulaiman bin Surd : On the day of Al-Ahzab (i.e. clans) the Prophet said, (After this battle) we will go to attack them(i.e. the infidels) and they will not come to attack us."