《亚格达斯经》由巴哈伊信仰的创立者巴哈欧拉所作，是巴哈伊信仰的核心著作。此书原以阿拉伯语写就，但是人们更多的以巴哈欧拉自己为此书所取的波斯语书名来称呼它。此书还被称作亚格达斯、至圣经书和律法书等。“亚格达斯”这一词因在许多语言中作为其语言基础字母（Q-D-Š）的最高级形式而具有重要意义。

虽然有一些证据显示部分章节完成的时间更早些，但一般认为在《亚格达斯经》成书于1873年左右。在《亚格达斯经》几年后，巴哈欧拉才把此书手稿副本寄给伊朗的巴哈伊，并且直到1890年到1891年间，他才着手处理此书的阿拉伯语版在印度孟买的出版事宜。

The Kitáb-i-Aqdas or Aqdas is the central book of the Bahá'í Faith written by Bahá'u'lláh, the founder of the religion, 1853-1873. It has the same status as the Quran for Muslims or the Bible for Christians. The work was written in Arabic under the Arabic title al-Kitābu l-Aqdas (Arabic:الكتاب الأقدس‎), but it is commonly referred to by its Persian title, Kitáb-i-Aqdas (Persian:كتاب اقدس‎‎), which was given to the work by Bahá'u'lláh himself. It is sometimes also referred to as "the Most Holy Book", "the Book of Laws" or the Book of Aqdas. The word Aqdas has a significance in many languages as the superlative form of a word with its primary letters Q-D-Š.