Javáhiru’l-Asrár (Arabic: جواهر الاسرار) or Gems of Divine Mysteries, is a book by Bahá'u'lláh, the founder of the Bahá'í Faith. The treatise was written in reply to a question from Siyyid Yúsuf-i-Sidihí Isfahání who had asked the question of how the promised Mihdí could have been "transformed" (meaning: the return of the Promised One in a different human guise) into the Báb. The work was revealed on the same day as the question had been received. Similar themes as those presented in the Gems of Divine Mysteries can be found in the Seven Valleys and in the Kitáb-i-Íqán.