Musnad Ahmad 938:60

Fayyad ibn Muhammad Abu Muhammad al-Raqqi narrated to us, from Ja'far—meaning ibn Burqan—from Thabit ibn al-Hajjaj, who said: Zayd ibn Thabit said: "The Messenger of Allah, peace and blessings of Allah be upon him, forbade us from *al-mukhabarah*." It was said to him: "What is *al-mukhabarah*?" He said: "That you take the land for a half, or for a third, or for a quarter, or for things similar to this."