لَيْسَ مِنَّا مَنْ خَبَّبَ امْرَأَةً عَلَى زَوْجِهَا، أَوْ عَبْدًا عَلَى سَيِّدِهِ
Not following our way is the one who maliciously turns a woman against her husband, or a servant against his master.
Source: أبو داود
لَيْسَ مِنَّا is a forceful moral warning; it should not be turned into a summary verdict on a particular person's faith. خَبَّبَ refers to deliberately corrupting a relationship or sowing hostility. عَلَى زَوْجِهَا indicates “against her husband.”
Planting suspicion or resentment through deceit can damage a marriage or another relationship of responsibility. The warning concerns malicious disruption. Listening to someone who is mistreated, protecting their safety, or helping them seek appropriate assistance is different from deliberately inciting unjust hostility.