قَالَ مَالِك : وَإِنَّمَا ذَلِكَ فِي الْخَطَإِ، أَنْ يَضْرِبَ الرَّجُلُ امْرَأَتَهُ فَيُصِيبَهَا مِنْ ضَرْبِهِ مَا لَمْ يَتَعَمَّدْ، كَمَا يَضْرِبُهَا بِسَوْطٍ فَيَفْقَأُ عَيْنَهَا وَنَحْوَ ذَلِكَ .
Imam Malik, may Allah have mercy on him, said that this is when a man injures his wife by mistake, not intentionally (if he does it intentionally, then retaliation will be obligatory).