وَلَا مَنْ يُصَلِّي فَرْضًا خَلْفَ مَنْ يُصَلِّي فَرْضًا آخَرَ.
Meaning: Someone performing one obligatory prayer cannot follow an imam performing another obligatory prayer.
For example, according to the Hanafi ruling, a person offering Zuhr fard does not follow an imam offering Asr fard. Both are obligatory, but they are distinct identified prayers.
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Whom May One Follow in Prayer? Qualifications and Validity of Imamate
وَلَا مَنْ يُصَلِّي فَرْضًا خَلْفَ مَنْ يُصَلِّي فَرْضًا آخَرَ.
Meaning: Someone performing one obligatory prayer cannot follow an imam performing another obligatory prayer.
For example, according to the Hanafi ruling, a person offering Zuhr fard does not follow an imam offering Asr fard. Both are obligatory, but they are distinct identified prayers.