宋高僧傳 1.55

1.55

Whenever Amoghavajra responded to an edict to pray for rain, he had no other procedures; he merely set up an embroidered seat, tossed and twirled a wooden deity of several inches in his hand, recited a mantra, and cast it down. When it stood erect of its own accord upon the seat, and one watched for the corners of its mouth to bare fangs and its eyes to blink, then the rain would arrive.