大佛頂如來放光悉怛多般怛羅大神力都攝一切呪王陀羅尼經大威德最勝金輪三昧呪品 1.211

1.211

「以右手作如來勅印召六天。以大指捻無名指甲上，并小指甲押上頭，中指直竪，指來去。若作法時，以此天當刀。」

"With the right hand form the Tathāgata's Command Mudrā to summon the Six Heavens: press the thumb upon the nail of the ring finger, and also press it down upon the nail of the little finger; the middle finger stands straight, moving back and forth. When performing the ritual, use this deva as the sword."