Narrated Abdullah bin Umar (may Allah be pleased with them): I know that during the time of the Messenger of Allah (peace and blessings of Allah be upon him), fields used to be given on rent. Afterwards, Abdullah (may Allah be pleased with him) thought that perhaps the Prophet (peace and blessings of Allah be upon him) had given a new ruling about this which he was not aware of, so he (out of caution) stopped renting out fields.