What is "rashh-i-'ama"

Rashh-i-'Amá ("Sprinkling of the Cloud of Unknowing") is the first known tablet written by Bahá’u’lláh, founder of the Bahá'í Faith in 1852. It is also the only known tablet of Bahá’u’lláh written in Qajar dynasty Persia. It is a poem of 20 verses in Persian, written when Bahá’u’lláh was imprisoned in the Síyáh-Chál in Tehran, after he received a vision of a Maid of Heaven, through whom he received his mission as a Messenger of God and as the One whose coming the Báb had prophesied.