Abdullah bin Umar reported,

Truly, Allah has made your blood and your property inviolable, as sacred as this day of yours, in this land of yours, in this month of yours. Have I not delivered the message?They said, "Yes."He said, "Allah, bear witness," three times. Then he said, "Woe to you! Take care not to turn back after me as disbelievers, striking one another's necks."

Bukhari 4403

Sahih

ألا إن الله حرم عليكم دماءكم وأموالكم كحرمة يومكم هذا في بلدكم هذا في شهركم هذا ألا هل بلغت قالوا نعم قال اللهم اشهد ثلاثا ويلكم أو ويحكم انظروا لا ترجعوا بعدي كفارا يضرب بعضكم رقاب بعض

البخاري 4403صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Expeditions
Chapter
Farewell Pilgrimage
Numbering
Darussalam 4403
Bukhari 4403