Musnad Ahmad 5:519

Abdullah narrated to us, Abu Bakr ibn Abi Shaybah and Muhammad ibn Abdullah ibn Numayr narrated to me, they said: Muhammad ibn Fudayl narrated to us, from Husayn ibn Abd al-Rahman, from Sa’d ibn Ubaydah, from Abu Abd al-Rahman al-Sulami, he said: I heard Ali saying: The Messenger of Allah (may Allah bless him and grant him peace) sent me, Abu Marthad, and al-Zubayr ibn al-Awwam, and all of us were horsemen. He said: "Go until you come to Rawdat Khakh." Thus said Ibn Abi Shaybah: "Khakh." And Ibn Numayr said in his hadith: "Rawdat such and such." And Ibn Numayr said: Affan narrated it to us, Khalid narrated to us, from Husayn: the like of it, he said: "Rawdat Khakh."