You prayer is valid in sha Allah but you made a mistake in repeating it.

When I went for Tajweed class, during the Asr time, sisters made their own jama’ah after the adhan in the cellphone but I did not join them. Then the imam made adhan and I waited for half an hour for the iqama. But there is no one in the brother’s section so I started to pray alone. when I finished praying, the imam called for the iqama so then again I joined the imam in salah. Is my salah valid?

Prayer | May 11, 2015 2:45 pm
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I have a male relative who claims to be very knowledgable in islam to the extend that he calls himself an imam. However, he is of the opinion that you can miss the jummah prayer on Fridays as long as you have not missed it 3 times in a row. So sometimes he prays at home for two fridays and he goes to the masjid on the third Friday. What is the punishment for missing 1 or 2 jummah prayers on purpose?
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I prayed my isha Salah after making wudhu and after about an hour I felt something like a small piece of food in my mouth. So does my prayer become invalid and do I need to perform it as a qada prayer because the time of isha was over when I found it?