وَلَا يُصَلِّي الْمُفْتَرِضُ خَلْفَ الْمُتَنَفِّلِ،
Meaning: A person performing an obligatory prayer does not follow an imam who is performing a voluntary prayer.
A muftarid is performing an obligatory prayer; a mutanaffil is performing a voluntary prayer. The cited Hanafi reasoning is that the follower’s obligatory act cannot be built upon the imam’s lesser obligatory status.
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Whom May One Follow in Prayer? Qualifications and Validity of Imamate
وَلَا يُصَلِّي الْمُفْتَرِضُ خَلْفَ الْمُتَنَفِّلِ،
Meaning: A person performing an obligatory prayer does not follow an imam who is performing a voluntary prayer.
A muftarid is performing an obligatory prayer; a mutanaffil is performing a voluntary prayer. The cited Hanafi reasoning is that the follower’s obligatory act cannot be built upon the imam’s lesser obligatory status.