The Peak of Eloquence · Hadith 2024 (#Passage #383)

فَقال (عليه السلام): إِنْ كُنْتَ كَاذِباً فَضَرَبَكَ اللهُ بِهَا بَيْضَاءَ لَامِعَةً لَا تُوَارِيهَا الْعِمَامَةُ.

Thereupon, Amīr al-mu’minīn, peace be upon him, said: If you are speaking a lie Allāh may afflict you with white spots (leucoderma) which even the turban may not cover.

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).