Is praying in the congregational mosque (Masjid al-Jami') better, and do mosques where Friday prayers are not held have the same rulings as the congregational mosque? And is every place designated for prayer, but without a regular Imam, considered a mosque? And does the first congregation have preference, and does congregational prayer in offices differ? And is the second congregation in the congregational mosque better than an individual's prayer?

The mosque is defined as an endowed place prepared for prayer. Praying in large congregational mosques is preferred due to the greater number of worshippers, as the large number of worshippers is one of the factors that gives preference to mosques. If a place is confirmed to be a mosque, then all rulings pertaining to mosques apply to it. It is not a condition for a mosque to have a permanent Imam, nor for all five prayers to be offered therein. Rooms at work and employee offices are not called mosques, but congregational prayer is permissible in them. The multiplication mentioned in the Hadith refers to the superiority of congregational prayer over praying individually. There is no dislike in forming a second congregation in a mosque where prayer has already been offered, and it is better than praying individually. The evidence for this is the Hadith of Ubayy ibn Ka'b and the Hadith of the one who gave charity to a man by praying with him after the congregational prayer had finished.