The Guhyasamāja Tantra (Sanskrit; Tantra of the Secret Community) is one of the most important scriptures of Esoteric Buddhism.
In its fullest form, it consists of seventeen chapters, though a separate "explanatory tantra" (vyākhyātantra) known as the Later Tantra (Uttaratantra) is sometimes considered to be its eighteenth chapter.
Many scholars believe that the original core of the work consisted of the first twelve chapters, with chapters thirteen to seventeen being added later as explanatory material
In India, it was classified as a Yoga or Mahayoga Tantra
In Tibet it is considered an Unexcelled Yoga Tantra (rnal ’byor bla med rgyud)
It develops traditions found in earlier scriptures such as the Sarva-tathāgata-tattva-saṃgraha but is focused to a greater extent on the antinomian aspects characteristic of the later Buddhist Tantras.
It survives in Sanskrit manuscripts and in Tibetan and Chinese translation.
According to one tradition, the Guhyasamāja Tantra was taught for the first time by the Buddha in the form of Vajradhara to Indrabhuti the King of Oddiyana, also called King Dza.
As with most tantras, there are different traditions and transmissions.
Perhaps the oldest surviving lineage is the Jñānapada Tradition (ye shes zhabs lugs), which goes back to Buddhaśrijñāna (late 8th century).
The most important historically is the Ārya tradition (gsang 'dus 'phags lugs) which is based on commentaries attributed to Nāgārjuna, Āryadeva, and Candrakīrti. 'Gos Lotsawa Khug pa lhas btsas originated a transmission in Tibet, as did Marpa Lotsawa.
The Sakya tradition received both transmissions.
Tsongkhapa, founder of the Gelug tradition, considered the Esoteric Community to be the most important of the tantras and used the Ārya tradition as a template for interpreting all the other tantric traditions.
In the practice of the Ārya Tradition, the central deity of the Guhyasamāja is blue-black Akṣobhyavajra, a form of Akṣobhya, one of the five tathāgathas (pañcatathāgata), sometimes called the dhyāni buddhas.
Akṣobhyavajra holds a vajra and bell (ghanta) in his first two hands, and other hands hold the symbols of the four other tathāgathas:
wheel of Vairocana and lotus of Amitābha in his rights, and gem of Ratnasambhava and sword of Amoghasiddhi in his lefts.
The maṇḍala consists of thirty-two deities in all.
In the Jñānapada tradition, the central deity is yellow Mañjuvajra, a form of Maṇjuśrī.
The deity has three faces—the right one is white and red one on the left—and six arms.
The three faces may represent the three main channels of the subtle body, the three stages of purification of the mind or the illusory body, light, and their union.
Mañjuvajra holds in his hands a sword and a book, and two of his other hand a bow and arrow represent skillful means (upāya).