Assalamu Alaykum Ustadh I prayed Salatul Assr as a traveler behind someone who is a resident but I realised after I joined the prayer, as I came late. So I only prayed 2 rakat behind him while he prayed 4. Is my Salah valid or do I have to repeat this Salah again and pray 4 rakat on my own ?

The fatwa of Imam Ibn Baz is that he repeats the salah.

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