﴿ وَإِذَا طَلَّقْتُمُ ٱلنِّسَآءَ فَبَلَغْنَ أَجَلَهُنَّ فَلَا تَعْضُلُوهُنَّ أَن يَنكِحْنَ أَزْوَٰجَهُنَّ إِذَا تَرَٰضَوْا۟ بَيْنَهُم بِٱلْمَعْرُوفِ ۗ ذَٰلِكَ يُوعَظُ بِهِۦ مَن كَانَ مِنكُمْ يُؤْمِنُ بِٱللَّهِ وَٱلْيَوْمِ ٱلْءَاخِرِ ۗ ذَٰلِكُمْ أَزْكَىٰ لَكُمْ وَأَطْهَرُ ۗ وَٱللَّهُ يَعْلَمُ وَأَنتُمْ لَا تَعْلَمُونَ ﴾

“And when you divorce women, and they have come to the end of their waiting-term, hinder them not from marrying other men if they have agreed with each other in a fair manner. This is an admonition unto every one of you who believes in God and the Last Day; it is the most virtuous [way] for you, and the cleanest. And God knows, whereas you do not know.”

When you divorce women and they have reached completed their term of waiting do not debar them — addressing the guardians here — from marrying their divorced husbands when they the male spouses and their women have agreed together honourably in accordance with the Law. The occasion for the revelation of this verse was Ma‘qil b. Yasār’s sister was divorced by her husband who then wanted to restore her but Ma‘qil refused as reported by al-Hākim. That the prohibition against debarring is an admonition for whoever of you believe in God and the Last Day because it is for the benefit of such a person; that refraining from debarring is purer for you better and cleaner for you and for them bearing in mind the suspicion that can be aroused by the couple on account of prior intimacy. God knows what is in your interest and you know not any of this so follow His commands.