Ibn al-Mubarak narrated it from Hammad bin Zayd, and in it Sayyiduna Ibn Umar (may Allah be pleased with them both) said: "We used to go on military expeditions with the Messenger of Allah (peace and blessings be upon him), and we would get honey and ghee and eat it."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17994