大毘盧遮那成佛經疏 13.79

13.79

次如來語門印。准前印，即作三補吒合掌，即以水指風指頭聚合於掌內，以二空指並壓之，其二地指、二火指並直而頭相並，尖如蜂形，即是也。真言歸命如前。

Next is the Tathāgata's Speech Gateway Seal. Based on the previous seal, make the sampuṭa añjali, gather the tips of the water fingers and wind fingers together inside the palms, press them side by side with the two space fingers, and keep the two earth fingers and two fire fingers straight and side by side, their tips pointed like the shape of a wasp; that is it. The homage of the mantra is as before.