Is it permissible to benefit from a sum of money that was presented to an individual, with their role in receiving this sum altered without their knowledge?

It is not permissible to take this money without the owner's knowledge, because the money has become his property, and it is not permissible to dispose of it without his permission, as the Prophet, peace and blessings be upon him, said: "The property of a Muslim person is not lawful [to take] except with his willing consent."