Musnad Ahmad 33:130

Yahya narrated to us, from Abd al-Malik, who said: Ata narrated to us, from Jabir, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever possesses land, let him cultivate it. If he is unable to do so, or is incapable regarding it, then let him grant it to his brother, and let him not lease it out."