Musnad Ahmad 493:4

Yahya ibn Adam and Yahya ibn Abi Bukayr narrated to us, they said: Isra'il narrated to us, from Abu Ishaq, from Habashi ibn Junadah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever asks [for charity] without being in poverty, it is as if he is eating live coals."