Abusive behavior is evil and murder is disbelief
BUKHARI 48:
from ʿAbdullāh —
The Prophet ﷺ said, "Abusing a Muslim is fusūq (evil doings) and killing him is kufr (disbelief)."
البخاري ٤٨:
عن عبد الله —
أَنَّ النَّبِيَّ ﷺ قَالَ: «سِبَابُ الْمُسْلِمِ فُسُوقٌ وَقِتَالُهُ كُفْرٌ۔»