question #3 Sahih Muslim 1066d, Book 12, Hadith 202 : What promise is mentioned for those who confront the Khawarij according to Islamic teachings?

Did you hear it from Muhammad (ﷺ)? He (Hadrat ‘Ali) said: Yes, by the Lord of the Ka’bah; Yes, by the Lord of the Ka’bah; yes, by the Lord of the Ka’bah.