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laysa ʿalā l-ʾaʿmā ḥarajun wa-lā ʿalā l-ʾaʿraji ḥarajun wa-lā ʿalā l-marīḍi ḥarajun wa-man yuṭiʿi llāha wa-rasūlahū yudkhilhu jannātin tajrī min taḥtihā l-ʾanhāru wa-man yatawalla yuʿadhdhibhu ʿadhāban ʾalīman
There is no blame on the blind, nor is there any blame on the lame, nor is there blame on the sick [if they are unable to go out with the troops to face the enemies]; and whoever obeys Allah and His Apostle, He will admit him into gardens with streams running in them, and whoever refuses to comply, He will punish him with a painful punishment.
— Ali Quli Qarai
Surah al-Fath - Verse 17
17. No sin is there upon the blind, nor is there sin upon the lame, nor is there sin upon the sick [that they turn away from fighting in Allah’s cause]. And whosoever obeys Allah and His Messenger, He will admit him to Gardens [of Paradise] beneath [whose trees] rivers flow; and whosoever turns back, He will chastise him with a painful torment.
Legislators are supposed to attend to all legal aspects and stipulate specific laws for special cases (e.g. the lame, the blind, and the ailing). The disabled will not be deprived of being admitted to Paradise unless they obey Divine Commands to the best of their abilities. It is reported on the occasion of the blessed Verse in question that upon being apprised of the order of engaging in jihad, the disabled entertained fear and informed the Noble Prophet (S) of their disabilities to participate in battles together with other believers and they were anxious of their fates.
Thus, the blessed Verse was revealed as per which there is no sin upon the blind, the lame, and the ailing if they fail to take part in jihad. Irrespective of the occasion of revelation, it is evident that it applies to all religious obligations. Thus,
“Whosoever obeys Allah and His Messenger”
refers that believers are supposed to obey God Almighty and His Messenger (S) in all cases, be it concerning jihad or otherwise, and those who are disabled and owing to their disabilities fail to perform a number of their obligations, they shall be rewarded with Divine Bounties so long as they obey Allah and His Prophet (S). Au contraire, those who are able to obey Allah and His Messenger (S) but they fail to act likewise shall be chastised with excruciating torments.