By repeating the word over and over again means that you have a serious problem in your prayer. This may lead to invalidating your prayers for engaging in an act that takes it out of the norm. Never do this again.

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This is an innovation and is something cultural. It has no basis in Islam and one shouldn’t do it unless that particular individual he has not seen for some time and he wants to greet him because of that and not because of the prayer.

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If you got the last Rakah with the imam, this is a valid congregational prayer.

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If he only relays the takbeer of the Imam because he is up front and can hear him, this is permissible. But if he is offering a new prayer where he is the Imam, this is invalid as there is an ongoing congregation and it is the original.

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You can say it once but the Sunnah is to say it three times. You can say it in any number you like.

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