The origin of the Vajra hook dates back to the early days of Vajrayana Buddhism, with its practices and mantras documented in tantric scriptures. The Vajra hook is mentioned in the Tangmi scripture 'The Birth of Thirty-seven Vajra Yoginis,' which states: 'All beings who follow the path of the Six Perfections will, from within the realm of the Tathagata's essence, generate the four Bodhisattvas: Vajra Hooks, Vajra Ropes, Vajra Locks, and Vajra Bells, who can summon, attract, firmly hold, and delight.' The seat of the four Bodhisattvas is located at the four gates of the stupa in the Vajra realm mandala, symbolizing their residence within the self-realized virtues and their manifestation to benefit others. Among the four Bodhisattvas, the Vajra Hook Bodhisattva, known as Vajra-nkusah (Tibetan: Rdo-rje lcags-kyu), resides at the first gate of the mandala, known for his steadfast and sharp bodhichitta, which leads sentient beings away from the realms of suffering, akin to a fisherman using a hook to catch fish. He is responsible for gathering the virtues of sentient beings and summoning all the enlightened beings to the gathering, signifying the accumulation of sentient beings' virtues.