You may let any of your wives leave amicably if they so wish, and likewise you may keep close those who accept the extra responsibilities as the mothers of believers (33:6), (33:28). If you reconcile with anyone you had estranged, you commit no error. This will gladden their eyes, their grief will disappear and all of them will be content with whatever you give them. Allah alone knows what is in your hearts, and Allah is Knower, Clement.