What is the ruling on the money my friend earns from selling cheap juice to me, and am I obligated to donate its value?

It is not permissible for a worker to take anything from the restaurant for himself or for others without the owner's permission, due to the Prophet's (peace be upon him) saying: "The property of a Muslim is not lawful except with his willing consent," and his saying: "It is not lawful for a man to take his brother's property without a just cause." Usurped property, whose owner is known, must be returned to him, and it is not permissible to benefit from it or suffice with donating its value as charity. The fatwas of the Permanent Committee affirm the prohibition of eating stolen food from a restaurant, even if its owner is stingy, and the property of a Muslim is not lawful except with his willing consent. Therefore, one must refrain from drinking the stolen juice and advise the one who stole it to repent and return what he took to its owner.