Praise be to Allah.
It is prescribed to offer the night prayers in Ramadaan in congregation or individually, but it is better to do it in congregation than to do it individually.
The Prophet (peace and blessings of Allaah be upon him) led his companions in offering these prayers in congregation on several nights.
It is proven in al-Saheehayn that the Prophet (peace and blessings of Allaah be upon him) led his companions in prayer (Taraweeh) for several nights, then on the third or fourth night he did not come out to them. When morning came he said: “Nothing prevented me from coming out to you except the fact that I feared that it would be made obligatory for you.”
Narrated by al-Bukhaari, 1129. According to the version narrated by Muslim (761): “But I feared that night prayers would be made obligatory for you and you would not be able to do them.”
Offering Taraweeh prayer in congregation is something that is established by the Sunnah of the Prophet (peace and blessings of Allaah be upon him). The Prophet (peace and blessings of Allaah be upon him) stated the reason why he did not persist in offering this prayer in congregation, which is that he feared that it might be made obligatory. This reason cased to be applicable after the Prophet (peace and blessings of Allaah be upon him) died, because when he (peace and blessings of Allaah be upon him) died, the wahy (revelation) ceased and there was no longer any worry that it might be made obligatory. Once the reason, which was the fear of it being made obligatory, disappeared with the cessation of the wahy, then the fact that it is Sunnah to offer this prayer in congregation resumed.
See al-Sharh al-Mumti’ by Shaykh Ibn ‘Uthaymeen, 4/78.