The Messenger of Allah (ﷺ) separated eighteen lots, that is, half, for his future needs and whatever befell the Muslims. These were al-Watih, al-Kutaybah, as-Salalim and their colleagues. When all this property came in the possession of the Prophet (ﷺ) and of the Muslims, they did not have sufficient labourers to work on it. The Messenger of Allah (ﷺ) called Jews and employed them on contract.
In-book : Book 20, Hadith 87
English translation : Book 19, Hadith 3008