仁王般若經疏 3.139

3.139

"When great waters flood and drown the common people, the seasons turn upside down, with winter rains and summer snows, winter thunderbolts and lightning, ice, frost, and hail raining down in the sixth month, red water, black water, and blue-green water raining down, mountains of earth and mountains of stone raining down, gravel and rocks raining down, rivers and streams flowing backward, mountains floating and rocks drifting—when such portents appear, one should also read and recite this sūtra: this is the fourth calamity."