When Allah (swt) talks about the faith and its fruits, the word of (succeed) comes as a result of that faith. This Arabic word is taken from the material matter; any earth-sourced material is extracted by ‘الفَلاح’ (ploughing) which is the farmer work in land, Allah (swt) had willed to call the results of good faith by this name.

زَكَّاهَا (purifies it): Purifies it from desecration, sins and wrongdoings. The source of the Arabic word is (the growing), that is, cultivating the faculty of goodness in yourself, only then you will be successful.