Sahih Bukhari Volume 008, Book 073, Hadith Number 069.

Narated By Ibn 'Umar : The Prophet said at Mina, "Do you know what day is today?" They (the people) replied, "Allah and His Apostle know better," He said "Today is 10th of Dhul-Hijja, the sacred (forbidden) day. Do you know what town is this town?" They (the people) replied, "Allah and His Apostle know better." He said, "This is the (forbidden) Sacred town (Mecca a sanctuary)." And do you know which month is this month?" They (the People) replied, "Allah and His Apostle know better." He said, ''This is the Sacred (forbidden) month." He added, "Allah has made your blood, your properties and your honor Sacred to one another (i.e. Muslims) like the sanctity of this day of yours in this month of yours, in this town of yours." (See Hadith No. 797, Vol. 2.)