Prophet Muhammad pbuh (Peace be upon him) said, Once upon a time there was a man who bought a piece of land from someone.  A few days later the buyer found a jar filled with gold in the ground he had bought.  So the buyer said to the land owner.  "Take it, this gold is yours, in fact I only buy your land and I do not buy your gold."  The land owner argued, "Behold, I have sold you my land and everything that is contained therein."  The two people, both the buyer and the seller  did not want to take the gold pot. Finally, they asked the third person to decide their dispute.  The third person judging them asked, "Do you have children?"  One of the two answered, “I have a male slave.” The other answered, “I have a slave girl.” The third person said, “Marry the male slave with your female slave, then provide them with the gold.  (Narrated by al-Bukhari and Muslim)

Translated from "101 Kisah Teladan"  written by  Muhammad Amin al-Jundi, Indonesian translation by Safrudin Edi Wibowo, Lc