آكل كما يأكل العبد فوا الذي نفسي بيده لو كانت الدنيا تزن عند الله جناح بعوضة ما سقى منها كافرا كأسا
It is reported that the Messenger of Allah, peace and blessings of Allah be upon him, said: I eat as (every) slave (Allah) eats. And I swear by Him in Whose Hand is my soul were this world worth a wing of a mosquito, He would not have given a drink of water to an unbeliever.
Hannad ibn al-Sari in his al-Zuhd li-Hannād from the words’ of Amra ibn Murra as a Mursal.
Also in al-Silsila al-sahih” (544 and 686)