فَمَنْ لَّمْ يَجِدْ فَصِيَامُ شَهْرَيْنِ مُتَتَابِعَيْنِ مِنْ قَبْلِ اَنْ يَّتَمَاۤسَّاۗ فَمَنْ لَّمْ يَسْتَطِعْ فَاِطْعَامُ سِتِّيْنَ مِسْكِيْنًاۗ ذٰلِكَ لِتُؤْمِنُوْا بِاللّٰهِ وَرَسُوْلِهٖۗ وَتِلْكَ حُدُوْدُ اللّٰهِ ۗوَلِلْكٰفِرِيْنَ عَذَابٌ اَلِيْمٌ ( المجادلة: ٤ )
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 (al-Mujādilah 58:4)
Sahih International:
And he who does not find [a slave] – then a fast for two months consecutively before they touch one another; and he who is unable – then the feeding of sixty poor persons. That is for you to believe [completely] in Allah and His Messenger; and those are the limits [set by] Allah. And for the disbelievers is a painful punishment. (Al-Mujadila [58] : 4)
1 Mufti Taqi Usmani
But whoever does not find (a slave) has to fast for two consecutive months before the two (spouses) touch one another. Then the one who is not able to do so has to feed sixty indigent persons. This is (laid down) so that you believe in Allah and His Messenger. These are the limits set by Allah; and for the disbelievers there is a painful punishment.