Surah At-Taubah (The Repentance), Verse 91

لَیْسَ عَلَی الضُّعَفَآءِ وَلَا عَلَی الْمَرْضٰی وَلَا عَلَی الَّذِیْنَ لَا یَجِدُوْنَ مَا یُنْفِقُوْنَ حَرَجٌ اِذَا نَصَحُوْا لِلّٰهِ وَرَسُوْلِهٖ مَا عَلَی الْمُحْسِنِیْنَ مِنْ سَبِیْلٍ وَاللّٰهُ غَفُوْرٌ رَّحِیْمٌ ۟

Laisa 'alad du'aafaaa'i wa laa 'alal mardaa wa laa 'alal lazeena laa yajidoona maa yunfiqoona harajun izaa nasahoo lillaahi wa Rasoolih; maa 'alal muhsineena min sabeel; wallaahu Ghafoorur Raheem

“There is no blame on those who are infirm, or ill, or who find no resources to spend (on the cause), if they are sincere (in duty) to Allah and His Messenger: no ground (of complaint) can there be against such as do right: and Allah is Oft-forgiving, Most Merciful.”

Quran 9:91 (Yusuf Ali Translation)