大毘盧遮那成佛經疏 13.89

13.89

Next is the mudrā of the Tathāgata's Applications of Mindfulness (smṛtyupasthāna). Form the saṃpuṭa (all of these are like an unopened lotus, with hollowed palms joined; check the earlier text again so as not to make an error), gather the two space [thumbs] and two wind [index fingers] together to pinch each other, and this is it. The method of pinching is that the nails of the four fingers should meet each other. The mantra homage is as before.