Praying with someone who missed the congregation during the prohibited times

Question:
The questioner: Honorable Shaykh, may Allah grant you success, is it permissible for me to pray with someone who missed the congregational prayer, so that it counts as charity for him, but this is during a time when prayer is prohibited?

Answer:
There is nothing wrong with it, if he has no one else to pray with. He prays alone, and you want to pray with him so that it becomes a congregation, so there is no harm. The people who came to the Masjid al-Khaif, where the Messenger of Allah (peace and blessings be upon him) was praying the Fajr prayer with the Muslims, and they sat down, he rebuked them for praying the Fajr prayer. He ordered them to pray with the people who were praying and not to sit behind them, and it would count as a voluntary prayer for them. They had already prayed, so this was a time of prohibition for them, but the Prophet (peace and blessings be upon him) ordered them to repeat the congregation, and it would count as a voluntary prayer for them. However, if they already have a congregation and they do not need you, no, do not pray with them.