Grief over the Prophet's death precludes adornment
Nahj al-Balāgha|Volume 1|Book 3|Chapter 473
٤٧٣. وَقِيلَ لَهُ (عليه السلام) : لَوْ غَيَّرْتَ شَيْبَكَ يَا أَمِيرَ الْمُؤْمِنِينَ. فَقَالَ (عليه السلام) :
473. It was said to Amīr al-mu’minīn, peace be upon him: We wish you had changed your grey hair, O’ Amīr al-mu’minīn. Then he said: