Halaalah

If the halaala is not prearranged, it will be permissible (i.e. if a person, of his own accord, marries a woman with the intention of making her halaal for her previous husband, thereafter he consummates the nikah and without any force and coercion, he divorces her. After the iddat period, she will be halaal for her previous husband). However, if the halaala is prearranged by the respective parties, it will be impermissible. Nabi (Sallallahu Alaihi Wasallam) cursed the one who carries out the halaala, and those who arrange the halaala”.