The ruling on establishing two congregations in one mosque at the same time

Question:
Honorable Shaykh, a congregation is praying the midday prayer in the mosque, and another group entered. The first congregation was praying, so they established the second congregation and prayed, leaving the first congregation. Thus, there were two congregations in the mosque at the same time. What is the ruling on the prayer of the second congregation that did not join the first?

Answer:
It is forbidden; it is not permissible. It is not permissible to have multiple congregations at the same time in one mosque. The Muslims are one community. We are forbidden from division. It is obligatory for anyone who enters the mosque while the congregation is praying to pray with them, to join them, and not to establish a second congregation, unless the imam of the first congregation has finished his prayer. In that case, there is no harm in establishing a second congregation. If the first congregation is still praying, then this is a matter that is not permissible. We are commanded to gather, commanded to pray the congregational prayer with the Muslims, not to separate, and not to differ. Yes.