Surah Al-Mujadilah (The Pleading Woman), Verse 4

فَمَنْ لَّمْ یَجِدْ فَصِیَامُ شَهْرَیْنِ مُتَتَابِعَیْنِ مِنْ قَبْلِ اَنْ یَّتَمَآسَّا فَمَنْ لَّمْ یَسْتَطِعْ فَاِطْعَامُ سِتِّیْنَ مِسْكِیْنًا ذٰلِكَ لِتُؤْمِنُوْا بِاللّٰهِ وَرَسُوْلِهٖ وَتِلْكَ حُدُوْدُ اللّٰهِ وَلِلْكٰفِرِیْنَ عَذَابٌ اَلِیْمٌ ۟

Famal lam yajid fa siyaamu shahraini mutataabi'ayni min qabli any-yatamaaassaa famal lam yastati' fa-it'aamu sitteena miskeena; zaalika litu'minoo billaahi wa rasoolih'wa tilka hudoodul laah; wa lilkaafireena 'azaabun aleem

“And if any has not (the wherewithal), he should fast for two months consecutively before they touch each other. But if any is unable to do so, he should feed sixty indigent ones, this, that ye may show your faith in Allah and His Messenger. Those are limits (set by) Allah. For those who reject (Him), there is a grievous Penalty.”

Quran 58:4 (Yusuf Ali Translation)