Musnad Ahmad 1153:789

Husayn and Abu Ahmad al-Zubayri narrated to us, they said: Isra'il narrated to us, from Abu Ishaq, from al-Aswad ibn Yazid, from Aisha, she said: "The Prophet, peace and blessings of Allah be upon him, would perform ghusl (ritual bath) due to janabah (major ritual impurity), then he would come to the mosque while his head was dripping, and he would be intending to fast that day."