Musannaf Ibn Abi Shayba 15:167

Abu Bakr narrated to us, he said: Abu al-Ahwas narrated to us, from Mansur, from Khalid ibn Sa'd, from an umm walad (a slave woman who has borne a child) of Abu Mas'ud al-Ansari, who said: I used to prepare nabidh (a drink made from soaked dates or raisins) for Abu Mas'ud in a green jar.