The Quran

لَيسَ عَلَى الأَعمىٰ حَرَجٌ وَلا عَلَى الأَعرَجِ حَرَجٌ وَلا عَلَى المَريضِ حَرَجٌ ۗ وَمَن يُطِعِ اللَّهَ وَرَسولَهُ يُدخِلهُ جَنّاتٍ تَجري مِن تَحتِهَا الأَنهارُ ۖ وَمَن يَتَوَلَّ يُعَذِّبهُ عَذابًا أَليمًا

Muhammad Asad

No blame attaches to the blind, nor does blame attach to the lame, nor does blame attach to the sick [for staying away from a war in God's cause];¹ but whoever heeds [the call of] God and His Apostle [in deed or in heart²], him will He admit into gardens through which running waters flow; whereas him who turns away will He chastise with grievous chastisement.

These three categories circumscribe metonymically all kinds of infirmities or disabilities which may prevent a person from actively participating in a war in God's cause.
This latter applies, by obvious implication, to such as are unable to participate in the fighting physically, but are in their hearts with those who fight.