The narrator Kathir told that al-Muttalib remarked: The one who told me about the Messenger of Allah (ﷺ) said: I still seem to see the whiteness of the forearms of the Messenger of Allah (ﷺ) when he rolled up his sleeves. He then carried it and placed it at his head saying: I am marking my brother's grave with it, and I shall bury beside him those of my family who die.
In-book : Book 21, Hadith 118
English translation : Book 20, Hadith 3200