大毘盧遮那成佛經疏 13.56

13.56

次如來心印。作法皆准於前，唯加舒火指。此所舒二指，皆屈第三節是也。真言歸命如前。

Next is the Tathāgata's Heart Seal. The procedure is based entirely on the preceding, only adding the extension of the fire finger. These two extended fingers are both bent at the third joint; that is it. The homage of the mantra is as before.