Musnad Ahmad 938:93

Ya'qub narrated to us, my father narrated to us, from Ibn Ishaq, Abu al-Zinad narrated to me, from 'Ubayd ibn Hunayn, from 'Abdullah ibn 'Umar, who said: A man from the people of al-Sham arrived with olive oil, and I bargained for it among those who were bargaining for it from the merchants, until I bought it from him. He said: Then a man stood up to me and offered me a profit on it until he satisfied me. He said: So I took his hand to strike it [to conclude the deal], but a man took hold of my forearm from behind me. I turned to him, and it was Zayd ibn Thabit. He said: "Do not sell it where you bought it until you move it to your own quarters, for the Messenger of Allah, peace and blessings of Allah be upon him, has forbidden that." So I withdrew my hand.