The ruling on one who prayed tarawih in his town and then entered the congregational mosque
Machine translationRead the Arabic original
Question : This is a question in which the questioner says: One who has prayed tarawih has already performed witr, and then he entered your mosque. Is it better for him to join you in the tarawih prayer, or what should he do?
Answer : Yes, it is better for him to join us, even if he has already performed witr, due to the generality of the saying of the Prophet (peace and blessings be upon him)Jami` at-Tirmidhi 219Sahih (Darussalam). And his prayer with us is a prayer with a cause, which is a person’s attendance at the congregation. Just as a person who has performed witr and then enters the mosque after witr prays two rak'ahs, and does not sit until he has prayed two rak'ahs, so prayers with a cause do not prevent the last prayer of the night from being witr.
Answer : Yes, it is better for him to join us, even if he has already performed witr, due to the generality of the saying of the Prophet (peace and blessings be upon him)
when you pray in your camp then you come to a Masjid with a congregation, then pray with them. That will be a voluntary prayer for you.
إذا صليتما في رحالكما ثم أتيتما مسجد الجماعة فصليا معهم فإنها لكما نافلة
Source
اللقاءات الرمضانية لعام 1410هـ - 4 — binothaimeen.net (13:21)
The Arabic text is a machine transcription of the audio recording.