[He] said, "My Lord, indeed my bones have weakened," meaning: they have become feeble, "and the head has flared up with white hair."
﴿قَالَ رَبِّ إِنِّي وَهَنَ الْعَظْمُ مني﴾ أَيْ: ضَعُفَ ﴿وَاشْتَعَلَ الرَّأْسُ شَيْبًا﴾.