al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
٢٦. وَقَالَ (عليه السلام): مَا أَضْمَرَ أَحَدٌ شَيْئاً إِلَّا ظَهَرَ فِي فَلَتَاتِ لِسَانِهِ وَ صَفَحَاتِ وَجْهِهِ.
26. Amīr al-mu’minīn, peace be upon him, said: Whenever a person conceals a thing in his heart it manifests itself through unintentional words from his tongue and (in) the expressions of his face. [1]
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