Love of dunya
Prophet Muhammad (s) purified people firstly by identifying the main sources of impurity or illness and then by explaining the best treatment for them. Amongst all the many things which make our soul ill, the most destructive is love of dunya or the worldly life. Indeed the foundation of most of our problems is love of dunya.
So in order to purify us, the Prophet (s) wants to help us rid ourselves of our love for dunya. He (s) does this in two ways; firstly, by being a good example of not being attached to dunya himself and secondly, by asking us to do things which would help us to be detached ourselves. The most important thing is to give money. When we are attached to something, we have to give it away so that we can gradually become detached from it.
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