Hadith #6614 (Sahih al-Bukhari)
Book: Blood Money (Ad-Diyat)
Narrator(s): Abu Zur'a bin 'Amr bin Jarir
Grade: Sahih

The Prophet (ﷺ) said during Hajjat-al-Wada`, “Let the people be quiet and listen to me. After me, do not become disbelievers, by striking (cutting) the necks of one another.”

Source: https://parallelquran.com/hadith/sahih-al-bukhari-6614/