Narrated Abu Huraira: Allah's Messenger (ﷺ) said, "The Day of (Judgment) will not be established till there is a war between two groups whose claims (or religion) will be the same"
Book 61 · Hadith 115
صحيح البخاري
Narrated Abu Huraira: Allah's Messenger (ﷺ) said, "The Day of (Judgment) will not be established till there is a war between two groups whose claims (or religion) will be the same"