Vowel marks can change an Arabic word’s meaning. الصَّبِرُ, with fatḥah on ṣād and kasrah on bāʾ, refers here to the intensely bitter substance aloe. الصَّبْرُ, with sukūn on bāʾ, means patience and perseverance. Confusing them reverses the image in the narration.
كَمَا يُفْسِدُ الصَّبِرُ الْعَسَلَ means “just as bitter aloe spoils honey.” الصَّبِرُ is the agent/subject and الْعَسَلَ the object. The contrast between bitterness and sweetness makes the warning memorable.
Ironically, the response encouraged by this teaching is الصَّبْرُ, patience, while the substance used in its comparison is الصَّبِرُ, bitter aloe.