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.

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"Baha'u'llah (November 12, 1817 - May 29, 1892), born Mirza Husayn-'Ali Nuri, was the founder of the Baha'i Faith.

He claimed to fulfill the Babi prophecy of "He whom God shall make manifest", but in a broader sense he also claimed to be the "supreme Manifestation of God", referring to the fulfillment of the eschatological expectations of a prophetic cycle beginning with Adam, and including Abrahamic religions, as well as Zoroastrianism, the Indian religions, and others. Baha'is see Baha'u'llah as the initiator of a new religion, as Jesus or Muhammad - but also the initiator of a new cycle, like that attributed to Adam.

Baha'u'llah authored many religious works, most notably the Kitab-i-Aqdas and the Kitab-i-lqan. He died in Bahji, Palestine, present-day Israel, and is buried there.