Hadith 1659
۞
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]
٢٦. وَقَالَ (عليه السلام): مَا أَضْمَرَ أَحَدٌ شَيْئاً إِلَّا ظَهَرَ فِي فَلَتَاتِ لِسَانِهِ وَ صَفَحَاتِ وَجْهِهِ.