The Nahj al-Balagha (Arabic: نهج البلاغة "Peak of Eloquence") is the most famous collections of sermons, letters and narrations, attributed to Imam Ali (Ali ibn Abi Talib). It was collected by Rejal-e-kabeer, a Shia scholar in the 1st century.
Nahj means open way, road, course, method or manner. Balaghah means eloquence, art of good style and communication, rhetoric etc