大毘盧遮那成佛經疏 13.136

13.136

Next is the Bodhisattva Kautūhala (translated as 'Dispelling Doubt,' or 'Dispelling Defilement.' When the assembly all have matters of doubt and astonishment that cannot be resolved, this bodhisattva proceeds to their place and cuts through their net of doubts; because he can serve as an uninvited friend and constantly cuts through the doubts and perplexities of all sentient beings, he is so named). His mudrā: interlock the fingers inward to form a fist-añjali, extend the two fire [middle] fingers with tips joined, and bend them at the third joint; this is it (the two space [thumbs] are erected outside as usual).