When the Qur'anic verse:" Those who sit (at home) from among mu'min" (iv. 94) was revealed, the son of Umm Maktum spoke to him (the Holy Prophet). (At this). the words:" other than those who have a trouble (illness)" were revealed.
لَمَّا نَزَلَتْ { لاَ يَسْتَوِي الْقَاعِدُونَ مِنَ الْمُؤْمِنِينَ} كَلَّمَهُ ابْنُ أُمِّ مَكْتُومٍ فَنَزَلَتْ { غَيْرُ أُولِي الضَّرَرِ}
When the Verse:-- "Not equal are those of the believers who sit (at home)" (4.95) was revealed, Allah Apostle called for Zaid who wrote it. In the meantime Ibn Um Maktum came and complained of his blindness, so Allah revealed: "Except those who are disabled (by injury or are blind or lame..." etc.) (4.95)
لَمَّا نَزَلَتْ {لاَ يَسْتَوِي الْقَاعِدُونَ مِنَ الْمُؤْمِنِينَ} دَعَا رَسُولُ اللَّهِ ﷺ زَيْدًا فَكَتَبَهَا فَجَاءَ ابْنُ أُمِّ مَكْتُومٍ فَشَكَا ضَرَارَتَهُ فَأَنْزَلَ اللَّهُ {غَيْرَ أُولِي الضَّرَرِ}
[Machine] I heard Al-Bara' saying, when this verse was revealed "Not equal are those believers who sit [at home] and those who strive and fight in the cause of Allah," the Messenger of Allah ﷺ called Zaid and he came with a shoulder on which it was written. Ibn Umm Maktum complained of his disability's harm, so the verse "not [to be incurred] by those who have incurred [the obligation of] the discharge of a burden" was revealed.
سَمِعْتُ الْبَرَاءَ يَقُولُ لَمَّا نَزَلَتْ هَذِهِ الْآيَةُ {لَا يَسْتَوِي الْقَاعِدُونَ مِنَ الْمُؤْمِنِينَ} دَعَا رَسُولُ اللَّهِ ﷺ زَيْدًا فَجَاءَ بِكَتِفٍ فَكَتَبَهَا فِيهِ فَشَكَا ابْنُ أُمِّ مَكْتُومٍ ضَرَارَتَهُ فَنَزَلَتْ {غَيْرَ أُولِي الضَّرَرِ}