Sa'id bin (Abi) Arubah narrates with his chain that the dispute was over an animal, but neither had any proof, so the Messenger of Allah (peace and blessings be upon him) said: "Let lots be drawn between the two of them for the oath."
Al-Shaykh said: If both have possession, the oath is upon both of them; and when they dispute over who is to begin, lots are to be drawn.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الدعوى والبينات / 21216