Praise be to Allah.
He should join the congregation having made the intention to perform Salaat-ul ‘Ishaa. This is in accordance with the evidence in the Saheeh Hadeeth related by Mu‘aaz concerning the permissibility of performing of Salaat-ul Fard (an obligatory Salaat) whilst being led by someone who is performing a Nafl (voluntary) Salaat. This way would also create less disturbance which could be resulted if there were two Salaats being performed aloud (during the recitation of al-Qu’raan, for example) as is the case with Salaat-ul ‘Ishaa and Salaat-ut Taraaweeh.
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