Narrated Abu Huraira:
The Prophet said, "The Hour will not be established till there is a war between two groups among whom there will be a great number of casualties, though the claims (or religion) of both of them...
After replying to the call of Mu'aththin. you should recite in Arabic Allah's blessings on the Prophet.
O Allah, Lord of this perfect call and established prayer. Grant Muhammad the intercession and favor, and raise...
-> Read More Info: Al-Bukhari 1/152, and the addition between brackets is from Al-Bayhaqi 1/410 with a good (Hasan) chain of narration. See 'Abdul-Azlz bin Baz's Tuhfatul-'Akhyar, pg. 38.