The ruling on praying behind an imam who does not meet the conditions of imamate
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Q364: The questioner asks: Does one who prays behind imams who do not meet the conditions of imamate have to repeat his prayer?
A364: If one who is proficient in reciting al-Fatihah prays behind an imam who is not proficient in reciting al-Fatihah, he must repeat the prayer. Likewise, if he prays behind
an open sinner, according to many scholars, he must repeat the prayer, unless not praying behind this open sinner would lead to harm. If not praying behind this open sinner would lead to harm and fitnah (trial, discord or temptation), he should pray behind him. However, if there is no harm and no fitnah (trial, discord or temptation) resulting from leaving the prayer behind him, he should not pray behind him.
A364: If one who is proficient in reciting al-Fatihah prays behind an imam who is not proficient in reciting al-Fatihah, he must repeat the prayer. Likewise, if he prays behind
an open sinner, according to many scholars, he must repeat the prayer, unless not praying behind this open sinner would lead to harm. If not praying behind this open sinner would lead to harm and fitnah (trial, discord or temptation), he should pray behind him. However, if there is no harm and no fitnah (trial, discord or temptation) resulting from leaving the prayer behind him, he should not pray behind him.
Source
www.alifta.gov.sa
The Arabic text is copied verbatim from the original source, without any edits.