大毘盧遮那成佛神變加持經蓮華胎藏菩提幢標幟普通真言藏廣大成就瑜伽 2.203

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The mantra of all Vajras who carry out commands is (all vajra bodhisattvas of the Tathāgata's three families share these messengers in common, meaning that this mantra attends beside the main deity, carrying out orders back and forth according to whatever is to be done. As above, entering the vajra unconquerable samādhi).