Nahj al-Balāgha

Hadith 2067
brotherhood
٤٧٩. وَقَالَ (عليه ‏السلام): شَرُّ الْإِخْوَانِ مَنْ تُكُلِّفَ لَهُ.
479. Amīr al-mu’minīn, peace be upon him, said: The worst comrade is he for whom formality has to be observed. [1]
Source: al-Sharīf al-Raḍī