Nahj al-Balāgha
Hadith 2172٢٨٢. وَقَالَ (عليه السلام): بَيْنَكُمْ وَبَيْنَ الْمَوْعِظَةِ حِجَابٌ مِنَ الْغِرَّةِ.
282. Amīr al-mu’minīn, peace be upon him, said: Between you and the preaching there is a curtain of deception.