Musnad Ahmad 27:1167

'Abd al-Razzaq narrated to us, Ma'mar informed us, from al-Zuhri's brother 'Abd Allah ibn Muslim, from Hamzah ibn 'Abd Allah ibn 'Umar, from his father, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Begging will continue to be with one of you until he meets Allah, while there is not a piece of flesh on his face."