[Machine] In his saying "and do not harm them" [Al-Baqarah 2:231], harm here means when a man divorces his wife three times, then takes her back before the end of the waiting period (during which the woman cannot remarry), and then divorces her again, and repeats this two more times, causing harm to the woman in doing so.
فِي قَوْلِهِ {وَلَا تُمْسِكُوهُنَّ ضِرَارًا} [البقرة 231] قَالَ الضِّرَارُ أَنْ يُطَلِّقَ الرَّجُلُ الْمَرْأَةَ تَطْلِيقَةً ثُمَّ يُرَاجِعَهَا عِنْدَ آخِرِ يَوْمٍ يَبْقَى مِنَ الْأَقْرَاءِ ثُمَّ يُطَلِّقَهَا ثُمَّ يُرَاجِعَهَا عِنْدَ آخِرِ يَوْمٍ يَبْقَى مِنَ الْأَقْرَاءِ يُضَارُّهَا بِذَلِكَ