Gender differences in jealousy as heresy versus belief
Nahj al-Balāgha|Volume 1|Book 3|Chapter 124
١٢٤. وَقَالَ (عليه السلام): غَيْرَةُ الْمَرْأَةِ كُفْرٌ وَغَيْرَةُ الرَّجُلِ إِيمَانٌ.
124. Amīr al-mu’minīn, peace be upon him, said: The jealousy of a woman (with co-wives) is heresy, while the jealousy of a man is a part of belief.