The Agent's Profit Without the Principal's Knowledge

Question
My sister wants to buy a set of pots that costs 25 dinars, and I told her that its price is 30 dinars. Is it permissible for me to take five dinars for myself without her knowledge? If it is not permissible, can I buy the pots with my money and then sell them for thirty?
Answer
I say, and with God's success: The agent is trustworthy, and it is not permissible for him to betray the agency. If he betrays, he must return what he has betrayed. Taking five dinars from you is a betrayal, and it is a corrupt wealth that must be returned to your sister. It is not permissible to play around by saying: I bought with my money and sold it; because the agent is not allowed to sell what belongs to someone else. And God knows best.
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