What is the ruling on the prayer of someone who caught the last rak'ah of 'Isha prayer behind the Imam, then after the Imam's Taslim, he stood up to complete his prayer and a man made him his Imam, then another person joined them, so that he became an Imam for two who were previously congregants?
Your prayer is valid, and the fact that a latecomer is following you does not affect its validity. However, your leading him in prayer is, according to the preponderant opinion among us, impermissible. As for a non-latecomer following you, that is permissible according to some scholars.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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