大毘盧遮那成佛經疏 14.35

14.35

次作三補吒，雙屈二水指入掌，餘如常，一切宿印，即是羅剎娑印也。凡上來所說地居天類之印，雙手作或一手作者皆得也。若持誦作務等因緣不暇兩手結，但左手作即成耳（上來經中云左手，圖上兩手者，當用此耳）。真言曰：

Next, form the saṃpuṭa, bend both water fingers into the palms, and keep the rest as usual; this mudrā of all asterisms is also the mudrā of the rākṣasas. All the mudrās of the terrestrial devas mentioned above may be performed with either both hands or one hand. If, due to chanting, manual tasks, and other causes, there is no time to bind them with both hands, forming them with only the left hand will suffice (where the sūtra above said the left hand while the drawings showed both hands, this principle should be applied). The mantra is: