Musnad Ahmad 30:1940

Aswad ibn Amir and Husayn narrated to us, they said: Abu Bakr ibn Ayyash narrated to us, from Abu Husayn; and Yahya ibn Ishaq narrated to us: Abu Bakr ibn Ayyash narrated to us, Abu Husayn narrated to us, from Salim ibn Abi al-Ja'd, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Charity is not lawful for a wealthy person, nor for one who is possessed of sound limbs and strength."