Praying Behind a Corrupt Person

Question
What is the ruling on praying behind someone who drinks alcohol? He is not always persistent in drinking; his family advises him, and he repents for a while, then returns to drinking, and so on.
Answer
I say, and with God's help: It is disliked to pray behind him, and he must repent from this major sin with a sincere repentance, and God knows best.
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