“Allah is most great, Allah is most great”, and one of you says in response: “Allah is most great”, Allah is most great; then says: “ I testify tht there is no god but Allah”, and he says in response: “I testify that there is no god but Allah”, then say:” I testify that Muhammad is the Messenger of Allah”, and he makes the response: “ I testify that Muhammad is the Messenger of Allah”, then says: “Come to prayer”, and he makes the response: “There is no might and no power except in Allah”: then says: “ Allah is most great, Allah is most great”, and he makes the response: “Allah is most great”, then says: “There is no god but Allah”, if he says this from his heart, he enter Paradise.
Sunan Abi Dawud Book 2, Hadith 137
When Allah bestowed Khaybar on the Messenger of Allah (ﷺ) as fay' (spoils of war without fighting), he divided the whole into thirty six lots. He put aside a half, i.e. eighteen lots, for the Muslims. Each lot comprised one hundred shares, and the Prophet (ﷺ) was with them. He received a share like the share of one of them.
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.
Sunan Abi Dawud Book 20, Hadith 87