Surah Al-Mujadilah, verse 4

فَمَن لَّمْ يَجِدْ فَصِيَامُ شَهْرَيْنِ مُتَتَابِعَيْنِ مِن قَبْلِ أَن يَتَمَآسَّا ۖ فَمَن لَّمْ يَسْتَطِعْ فَإِطْعَامُ سِتِّينَ مِسْكِينًا ۚ ذَٰلِكَ لِتُؤْمِنُوا۟ بِٱللَّهِ وَرَسُولِهِۦ ۚ وَتِلْكَ حُدُودُ ٱللَّهِ ۗ وَلِلْكَـٰفِرِينَ عَذَابٌ أَلِيمٌ ﴿٤﴾

58:4 But whoever cannot afford this must fast for two consecutive months before the couple have intimate relation with each other. But if he is unable to do that, he must feed sixty needy people. This is so that you may truly believe in Allah and His Messenger. These are the limits ordained by Allah, and for the disbelievers there will be a painful punishment