Nahj al-Balāgha
Hadith 2244۴۵۰. وَقَالَ (عليه السلام): مَا مَزَحَ امْرُؤٌ مَزْحَةً إِلَّا مَجَّ مِنْ عَقْلِهِ مَجَّةً.
450. Amīr al-mu’minīn, peace be upon him, said: Whenever a man cuts a joke he separates away a bit from his wit.