Musnad Ahmad 1201:2

Ibrahim ibn Mahdi narrated to us, he said: Ali ibn Mushir narrated to us, from Abd al-Aziz ibn Umar ibn Abd al-Aziz, from Salih ibn Kaysan, from Abu Bakr ibn Abd al-Rahman ibn Sulayman ibn Abi Hathma, from al-Shifa bint Abd Allah, she said: The Prophet, peace and blessings of Allah be upon him, entered upon us while I was with Hafsa. He said to me: "Will you not teach this one the *ruqyah* (incantation) for the ant-bite, just as you taught her writing?"