Damrah ibn Rabī'ah (d.203H) said:

فَرْحَةُ إِبْلِيسَ إِذَا فَرَّقَ بَيْنَ الْمُتَحَابِّينَ، كَفَرْحَتِهِ حِينَ أَخْرَجَ آدَمَ مِنَ الْجَنَّةِ

Shaytān's joy when he separates those who love each other is like his joy when expelling Ādam from Jannah.

مساوئ الأخلاق للخرائطي (٢٢٧)