Divorce is Thrice

This honorable Ayah abrogated the previous practice in the beginning of Islam, when the man had the right to take back his divorced wife even if he had divorced her a hundred times, as long as she was still in her `Iddah (waiting period). This situation was harmful for the wife, and this is why Allah made the divorce thrice, where the husband is allowed to take back his wife after the first and the second divorce (as long as she is still in her `Iddah). The divorce becomes irrevocable after the third divorce, as Allah said:

الطَّلَـقُ مَرَّتَانِ فَإِمْسَاكٌ بِمَعْرُوفٍ أَوْ تَسْرِيحٌ بِإِحْسَـنٍ

After dealing with the above problem, the third talaq was mentioned in this manner فَإِن طَلَّقَهَا فَلَا تَحِلُّ لَهُ مِن بَعْدُ حَتَّىٰ تَنكِحَ زَوْجًا غَيْرَ‌هُ that is, if that person goes on to pronounce the third talaq as well (something not liked by the Shari'ah), the transaction of nikah shall stand totally annulled. He has exhausted his choice to revoke his divorce and take his wife back. And since he transgressed the limits of Shari'ah by unnecessarily giving the third talaq, he must now have his punishment whereby it is not possible for them to remarry each other even if both of them agree to do so. Now, in order that they could remarry each other, the condition of such nikah is that the woman (after completing her period of ` iddah following talaq) should enter into marriage with another man, fulfill matrimonial obligations and live with this other husband. Thereafter, if by chance that other husband also divorces her (or dies), she could remarry the first husband after completing her ` iddah. The last sentence of the verse says:

فَإِن طَلَّقَهَا فَلَا جُنَاحَ عَلَيْهِمَا أَن يَتَرَ‌اجَعَا