Yahya related to me from Malik that he had heard that theMessenger of Allah, may Allah bless him and grant him peace, said,"Try to go straight, although you will not be able to do so. Act, andthe best of your actions is the prayer. And only a mumin is constantin his wudu." (IT)
USC-MSA web (English) reference: Book 2, Hadith 37 (IT)
Arabic reference (IT): Book 2, Hadith 67 (IT)