大日經持誦次第儀軌 1.35

1.35

金剛薩埵契，結金剛智印，
止觀手相背，地、水、火、風輪。
左右互相持，二空各旋轉，
合於慧掌中，是名為法輪，
最勝吉祥契。

The Vajrasattva mudrā: form the vajrajñāna-mudrā, / Backing the hands of śamatha and vipaśyanā against each other. / The earth, water, fire, and wind wheels / On the left and right mutually hold each other; / The two space-[wheels] each rotate / And unite inside the palm of prajñā. / This is called the Dharma wheel, / The most supreme and auspicious mudrā.