It is not permissible for the agent to take anything from the principal's money without his permission
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The seventeenth question of the fatwa number ( 8267 )
Q17: I entrusted someone else to buy a commodity for me, and its price was, for example, five pounds, but the man gave it to him for four and a half pounds. Is he allowed to take the remainder, which is half a pound, or not?
A 17: This is considered an agency, and it is not permissible for the agent to take anything from the principal's money without his permission; due to the generality of the evidence prohibiting the taking of a Muslim's money except by his own willing consent. And success is from Allah, and may Allah send prayers and blessings upon our Prophet Muhammad, his family, and his Companions.
Q17: I entrusted someone else to buy a commodity for me, and its price was, for example, five pounds, but the man gave it to him for four and a half pounds. Is he allowed to take the remainder, which is half a pound, or not?
A 17: This is considered an agency, and it is not permissible for the agent to take anything from the principal's money without his permission; due to the generality of the evidence prohibiting the taking of a Muslim's money except by his own willing consent. And success is from Allah, and may Allah send prayers and blessings upon our Prophet Muhammad, his family, and his Companions.
Source
www.alifta.gov.sa
The Arabic text is copied verbatim from the original source, without any edits.