The Greatest of Righteous Deeds?

The greatest of righteous deeds is Imaan (belief) as it has come in the authentic hadeeth: "That a man asked the Prophet ﷺ about the greatest of actions, so he ﷺ said: Imaan in Allah tabaraka wa ta'la." So, Imaan is an action of the heart. It is not like how some people assume that Imaan has no correlation with (physical) actions, no! (Rather) Imaan is firstly, that the heart must be moved with the Iman of Allah and His Messenger. Then, it is a must with this Imaan that has become firmly established in the hearts that it becomes apparent on the body and limbs.