لَّيْسَ عَلَى ٱلضُّعَفَآءِ وَلَا عَلَى ٱلْمَرْضَىٰ وَلَا عَلَى ٱلَّذِينَ لَا يَجِدُونَ مَا يُنفِقُونَ حَرَجٌ إِذَا نَصَحُوا۟ لِلَّهِ وَرَسُولِهِۦ ۚ مَا عَلَى ٱلْمُحْسِنِينَ مِن سَبِيلٍ ۚ وَٱللَّهُ غَفُورٌ رَّحِيمٌ
“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.”
Part of the well-established hypocrites-who-stayed-behind-from-Tabuk passage of Surat al-Tawbah.