Nahj al-Balāgha
Hadith 1652١٧. وَسُئِلَ (عليه السلام) عَنْ قَوْلِ الرَّسُولِ (صلى الله عليه وآله وسلم): غَيِّرُوا الشَّيْبَ وَلَا تَشَبَّهُوا بِالْيَهُودِ. فَقَالَ (عليه السلام):
17. Amīr al-mu’minīn, peace be upon him, was asked to explain the saying of the Messenger of Allāh: “Banish your old age (by hair-dye) and do not acquire resemblance to the Jews.” Amīr al-mu’minīn replied: