At Tawbah Ayah 91

لَّيْسَ عَلَى ٱلضُّعَفَآءِ وَلَا عَلَى ٱلْمَرْضَىٰ وَلَا عَلَى ٱلَّذِينَ لَا يَجِدُونَ مَا يُنفِقُونَ حَرَجٌ إِذَا نَصَحُواْ لِلَّهِ وَرَسُولِهِۦ‌ۚ مَا عَلَى ٱلْمُحْسِنِينَ مِن سَبِيلٍ‌ۚ وَٱللَّهُ غَفُورٌ رَّحِيمٌ ٩١ There is no blame on the weak, the sick, or those lacking the means ?if they stay behind?, as long as they are true to Allah and His Messenger. There is no blame on the good-doers. And Allah is All-Forgiving, Most Merciful.