Hadees related to Abu Quhafa

Asma binte Abu Bakr Radiyallahu 'anha narrates the story of the acceptance of Islam by Abu Quhafa. When Rasulullah Sallallahu 'alaihi wasallam entered Makkah (on the day it was conquered) and came to Masjidul Haram, Abu Bakr Radiyallahu 'anhu came there holding his father's hand. When Rasulullah Sallallahu 'alaihi wasallam saw them, he said: Why did you not leave this old man at home I would have gone to him myself? Abu Bakr Radiyallahu 'anhu replied: O Rasulallah! It is more of his right that he comes to you instead of your going to him.Rasulullah Sallallahu 'alaihi wasallam made him sit in front of him and stroked his chest and then said: Accept Islam, and he accepted Islam. When Abu Bakr Radiyallahu 'anhu brought his father to Rasulullah Sallallahu 'alaihi wasallam, his hair were as white as the Thaghamah tree; so, Rasulullah Sallallahu 'alaihi wasallam said: Dye his hair. (Musnad
Ahmad, Tabarani, Majma-'uz-Zawaid)

Note: Thaghamah is a tree, which is as white as snow. (Majma Bihar- ul-Anwar).