大毘盧遮那成佛經疏 13.94

13.94

次如意摩尼普賢印。所以名普賢者，以此菩薩所有三業普皆賢善，諸佛菩薩之所讚歎故也。其印作三補吒，以二風指轉加二火指之背後當節令圓，是也。餘如常。真言歸命如前。

Next is the mudrā of Cintāmaṇi-Samantabhadra. The reason he is named Samantabhadra ('Universally Good') is that all three karmas of this bodhisattva are universally virtuous and good, praised by all buddhas and bodhisattvas. As for his mudrā, form the saṃpuṭa, cross the two wind [index] fingers over the backs of the two fire [middle] fingers at the joints so as to make them round, and this is it. The rest is as usual. The mantra homage is as before.