A disfellowshipped person is not automatically accepted back into the congregation after a certain amount of time has passed.
(‏ مزمور ٣٢ :‏ ​ ١ ،‏ ٢‏ )‏ فَكَمْ كَانَ رَائِعًا أَنْ يَنَالَ رَحْمَةَ ٱللهِ !‏