Musnad Ahmad 1153:861

Ahmad ibn Abd al-Malik narrated to us, he said: Zuhayr narrated to us, he said: Abu Ishaq narrated to us, from al-Aswad ibn Yazid, from Aisha: "That the Messenger of Allah (peace and blessings of Allah be upon him) used to perform ghusl (full ablution) and pray the two rak'ahs, and I do not see him performing wudu (ablution) after the ghusl."