The divorce

Bukhari :: Book 3 :: Volume 50 :: Hadith 881
Narrated Abdullah bin Umar:
Allah's Apostle gave the land of Khaibar to the Jews on the condition that they would work on it and cultivate it and they would get half of its yield.

Bukhari :: Book 3 :: Volume 50 :: Hadith 882
Narrated Uqba bin Amir:
Allah's Apostle said, "From among all the conditions which you have to fulfill, the conditions which make it legal for you to have sexual relations (i.e. the marriage contract) have the greatest right to be fulfilled."

Bukhari :: Book 3 :: Volume 50 :: Hadith 883
Narrated Rafi bin Khadij:
We used to work on the fields more than the other Ansar, and we used to rent the land (for the yield of a specific portion of it). But sometimes that portion or the rest of the land did not give any yield, so we were forbidden (by the Prophet ) to follow such a system, but we were allowed to rent the land for money.

Bukhari :: Book 3 :: Volume 50 :: Hadith 884
Narrated Abu Huraira:
The Prophet said, "No town-dweller should sell for a bedouin. Do not practice Najsh (i.e. Do not offer a high price for a thing which you do not want to buy, in order to deceive the people). No Muslim should offer more for a thing already bought by his Muslim brother, nor should he demand the hand of a girl already engaged to another Muslim. A Muslim woman shall not try to bring about The divorce of her sister (i.e. another Muslim woman) in order to take her place herself."