Musnad Abu Ya'la al-Mawsili 209:82

Abu Khaythama narrated to us, Jarir ibn Abd al-Hamid narrated to us, from Hisham, from his father, from Zaynab bint Umm Salama, from Umm Salama, who said: The Messenger of Allah (peace and blessings of Allah be upon him) was sitting in the house of Umm Salama, and there was a *mukhannath* (effeminate man) sitting with him. He said to Abd Allah ibn Abi Umayya, the brother of Umm Salama: "O Abd Allah, if Allah grants you victory over al-Ta'if tomorrow, I will guide you to the daughter of Ghaylan, a woman from Thaqif, who approaches with four [folds] and departs with eight." The Messenger of Allah (peace and blessings of Allah be upon him) said: "Let this one not enter upon you."