Wa izaa tallaqtumun nisaaa'a fabalaghna ajalahunna falaa ta'duloo hunna ai yankihna azwaaja humna izaa taraadaw bainahum bilma' roof; zaalika yoo'azu bihee man kaana minkum yu'minu billaahi wal yawmil aakhir; zaalikum azkaa lakum wa athar; wallaahu ya'lamu wa antum laa ta'lamu wa antum laa ta'lamoon
And when you divorce women and they have fulfilled their term, do not prevent them from remarrying their [former] husbands if they [i.e., all parties] agree among themselves on an acceptable basis. That is instructed to whoever of you believes in Allah and the Last Day. That is better for you and purer, and Allah knows and you know not.
1 Mufti Taqi Usmani
When you have divorced women, and they have reached (the end of) their waiting period, do not prevent them from marrying their husbands when they mutually agree with fairness. Thus the advice is given to everyone of you who believes in Allah and in the Hereafter. This is more pure and clean for you. Allah knows and you do not know.