What is the origin of the legend of clay bodhisattva?

Clay idol crossing the river is a two-part allegorical saying.

The so-called two-part allegorical saying is a unique argot in Chinese and a language with strong folk color. It has a distinctive spoken language, vivid, lively, popular and humorous.

It mainly comes from historical allusions and folklore, or takes its homophony and characteristics to express the finishing touch of language with concise words. Its playful humor and connotation make people linger and have endless aftertaste.

The clay idol can't protect himself when crossing the river: it means that the clay idol melts as soon as it falls into the water, and it can't protect others or even save itself! . Metaphor is self-care, let alone helping others. What's the use of asking me about this? Now I'm a clay idol crossing the river-I can't protect myself. Or let a clay idol cross the river, a clay idol fall into the water and a clay idol cross the river.