Al-Mujadila · 58:4

4. So whoever cannot find a slave to free, it is necessary upon him to fast for two months consecutively before he has sexual intercourse with the wife he did Ẓihār to. Then, whoever is incapable of fasting for two months consecutively, should feed sixty poor people. This command I have given is so that you believe that Allah is the one who has commanded you with it and so you carry it out. These rulings that I legislate for you are My limits I have set for My servants, so do not trespass them. As for those who disbelieve in the commands of Allah and the limits He has set, they will face a painful punishment.