Musnad Ahmad 1153:1174

Abu Ahmad al-Zubayri narrated to us, Ayman ibn Nabil narrated to us, from Umm Kulthum, from Aisha, who said: When it was said to the Messenger of Allah, may Allah bless him and grant him peace, that such-and-such a person is ill and does not eat food, he would say: "You must use talbina, so feed it to him." "For by the One in whose hand is my soul, it washes the stomach of one of you just as one of you washes his face with water from dirt."