al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
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.
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