Tafsir of Yusuf 12:75

They said: "His penalty should be that he, in whose bag it is found, should be held for the punishment. Thus we punish the wrongdoers!'' This was the law of Prophet Ibrahim, peace be upon him, that the thief be given as a slave to the victim of theft. This is what Yusuf wanted, and this is why he started with their bags first before his brother's bag, to perfect the plot,