This is a hadith taken from 'Glad Tidings of Mustafa for the Shia of Murtadha' and the original source is Ma'ni al-Akhbar by Sheikh As-Sadooq, p59. It is a speech that Imam Ali (as) gave to the people in the last days of his life. It details the merits of Imam Ali (as) and the names that other religions and nations have used for him.