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Shastradhara (weapon holding) Hevajra is described in the Samputa Tantra - a shared explanatory Tantra of the Hevajra Root Tantra. Aside from the Samputa Tantra, the most common reference and ritual source for the Shastradhara form of Hevajra is the Vajravali text of Abhayakaragupta.
Jeff Watt 1-2013