Musnad Ahmad 768:2

Waki’ narrated to us, Isma’il ibn Abi Khalid narrated to us, from Hakim ibn Jabir, from his father, who said: I entered upon the Prophet, peace and blessings of Allah be upon him, in his house, and I saw some gourd (pumpkin) with him. I said: "O Messenger of Allah, what is this?" He said: "This is a gourd with which we increase our food."