Narrated Ibn `Umar: The Prophet said, "Wailakum" (woe to you) or "waihakum" (May Allah be merciful to you)." Shu`ba is not sure as to which was the right word. "Do not become disbelievers after me by cutting the necks of one another."
Hadith ReferenceSahih Bukhari / The Book of Al-Adab (Good Manners) / Hadith: 6166
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة