I hear at the end of the prayer from some people, when they finish the prayer.

One of them says to his brother: May Allah the Almighty accept, and the other replies: From us and from you, righteous deeds. Is this from the sunnah?

There is no basis for it, but the sunnah is the foundation.

May Allah reward you with goodness. Do you advise, noble Sheikh, to avoid such phrases? There is no harm in saying them, meaning they are not well known.