The Epistle to the Son of the Wolf is the last major work of Bahá'u'lláh, founder of the Bahá'í Faith, before his death in 1892. It is a letter written to a Muslim cleric, a violent opponent of the Bahá'ís who, along with his father (called by Bahá'u'lláh "the wolf"), also a Muslim cleric, had put to death a number of Bahá'ís. In this work Bahá'u'lláh quotes extensively from his own previously revealed scriptures. This makes a large portion of the work a summary of excerpts on critical concepts expressed in previous works in a condensed form.