Musannaf Ibn Abi Shayba 16:385

Abu Bakr narrated to us, he said: Zayd ibn al-Hubab narrated to us, from Abdullah ibn al-Mu'ammal, from Ibn Abi Mulaykah, from Aisha, she said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Excellent is the condiment, vinegar."