Musnad Ahmad 1153:1264

Husayn ibn Ali narrated to us, from Za'idah, from Abd al-Aziz ibn Rufay', from Ikrimah and Ibn Abi Mulaykah, from Aisha, who said: "The Messenger of Allah (peace and blessings of Allah be upon him) would pass by the cooking pot, take the meat bone, and eat from it. Then he would pray, and he did not perform ablution, nor did he touch water."