What is the ruling on a person praying alone behind the rows when he is unaware of the ruling?
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The Shaykh : Yes, the correct view is that if a person prays alone behind the rows and the row in front of him is not yet complete, his prayer is invalid and he must repeat it, even if he was unaware of the ruling. This is because the Prophet (peace and blessings be upon him) saw a man praying behind the rows and ordered him to repeat the prayer, without asking: "Did you know or not?" Yes.