大毘盧遮那成佛經疏 13.86

13.86

次如來十力印。屈地空指在掌中，令頭聚合相柱，餘指作三補吒合掌是也。真言歸命如前。

Next is the Tathāgata's Ten Powers Seal. Bend the earth and space fingers into the palms so that their tips gather and touch each other, and with the remaining fingers form the sampuṭa añjali; that is it. The homage of the mantra is as before.