Muwatta Imam Malik (Riwayat Yahya)

Imam Malik, may Allah have mercy on him, said that the owner of the garden can stipulate the following conditions upon the worker: to maintain the boundaries of the garden, to keep the water springs clean, to keep the bases of the trees clean, to keep the trees clean, to prune them, to cut from the date palm trees, and other similar tasks. He has the option to fix half of the fruit for the worker or more or less, provided that both are agreeable. It is not permissible for the owner of the land to stipulate upon the worker the making of anything new, such as digging a well or a water reservoir, or running a spring, or planting other trees whose roots the worker brings, or making a pond, with the intention that the income of the garden may increase.