大毘盧遮那成佛經疏 14.15

14.15

次合掌屈風地入掌聚合。其火水指令團圓屈如弓，此是日后社耶印。風印如前者，須申左手側掌，屈地水指是也，此是風幢印。先仰左手當臍，如承把瑟狀，右手風空捻，餘散申之，向身運動如彈絃之狀，是妙音天印也。此即攝乾闥婆等，此是天后，亦言乾闥婆類。

Next, join the palms, bending wind and earth into the palms to gather together. Bend the fire and water fingers in a circular curve like a bow; this is the mudrā of Jayā, Queen of the Sun. For the Wind mudrā, as before, extend the left hand with the palm turned sidewise and bend the earth and water fingers; this is the wind-banner mudrā. First hold the left hand palm upward before the navel, as if holding a vīṇā, pinch wind and space with the right hand while extending the rest spread out, and move it toward the body as though plucking strings; this is the Sarasvatī mudrā. This subsumes the gandharvas and others; she is a devī, and is also called of the gandharva class.