Du'a Kumayl
Dua Kumayl (Arabic: دعاء كميل) (literally the Supplication of Kumayl) is a supplication famous among Shi'a for its perceived beauty and a traditional supplication in Shi'a Muslim spiritual practice. The Du'a is not an exclusively Shi'a dua, however, as none of its content is controversial among Shi'a and Sunni schools of thought.
Read more about Du'a Kumayl: Revelation of Dua Kumayl, Du'a