لَّيْسَ عَلَى الْأَعْمَىٰ حَرَ‌جٌ (There is no blame on the blind, nor is there any blame on the lame, nor is there any blame on the sick...48:17) Sayyidna Ibn ` Abbas ؓ reports that when some sincere Muslims who were physically unable to fight read the concluding clause of verse 16: وَإِن تَتَوَلَّوْا كَمَا تَوَلَّيْتُم مِّن قَبْلُ يُعَذِّبْكُمْ عَذَابًا أَلِيمًا .

“ And if you turn away, as you had turned away before, He will punish you with a painful punishment. [ 48:16] " they expressed their concern about the warning. Verse [ 17] was revealed to exempt them from the injunction of jihad. These people included blind, lame or sick persons (Qurtubi). And Allah knows best!