無量壽經連義述文贊 3.177

3.177

經曰「說是語已」至「唯見佛光」者，述云：此第三、彼佛放光應請令見。滉瀁者，積水貌，猶浩蕩也。汗者，熱氣所蒸液也（下旦反）。又污（烏臥反），泥著物也。《說文》「穢也」，宜從初也。今言浩汗者，布水貌。

On the passage from the sūtra beginning "Having spoken these words" to "only the Buddha's light was seen": the commentary states: This is the third part, that Buddha emitting light in response to the request, enabling them to see. Huangyang describes the appearance of accumulated water, like vast and surging waves. Han is fluid steamed by heat (xia-dan phonetically). Also wu (wu-wo phonetically) means mud sticking to things; the Shuowen says 'filth', which fits the former. Here 'haohan' describes the expanse of surging waters.