It is narrated from Sayyiduna Dhirar bin Azwar that once my family sent me to the Prophet (peace and blessings be upon him) with a milking she-camel. The Prophet (peace and blessings be upon him) ordered me to milk her. When I started milking her, the Prophet (peace and blessings be upon him) said: Leave enough milk in her udders so that it can be obtained again.