the noblest in lineage, then the most God-fearing, and, if necessary, the one chosen by drawing lots (1).
The owner of the house and the appointed imam of the mosque have the strongest claim, and a free man, a resident, and a sighted person (2) take precedence over their opposites.
It is invalid to pray behind an openly sinful person (3), or behind a woman or an intersex individual when leading men (4), or a minor leading an adult. Likewise, one may not follow a mute person or anyone unable to perform an indispensable pillar or meet a required condition—except for someone with the same disability. The lone exception is the neighbourhood imam whose illness is expected to pass: the congregation may pray behind him sitting, which is recommended. If he began the prayer standing with them but then became unable and sat down, they should complete the prayer standing. Nor is it valid to follow an imam who knowingly remains in a state of ritual impurity or physical defilement. If both imam and follower were unaware of his impurity until the prayer concluded, the follower’s prayer remains valid (5).
A person who cannot recite al-Fātiḥah correctly, who assimilates letters that should not be assimilated, who substitutes one letter for another—apart from pronouncing the ḍād in al-maghḍūbi and al-ḍāllīn as ẓāʾ—or who makes a mistake that changes the meaning, may not lead the prayer except someone with the same defect. If he is able to correct the error yet fails to do so, his own prayer is invalid.
It is disliked for a habitual mis-reciter (laḥḥān), a stammerer (faʾfaʾ) (6), and the like, or for anyone who cannot articulate certain letters clearly, to lead the prayer.