What is the ruling on a husband using his wife's car, which she purchased with her own money, to transport people with the intention of doing good, without her consent, while he claims the right to dispose of it merely for assistance without any financial compensation?

A wife's money is her exclusive right, and it is impermissible for the husband to take or use it without her permission. Scriptural texts emphasize the sanctity of property and the preservation of rights, such as the Prophet's (peace be upon him) sayings: "It is not lawful for a man to take his brother's property without right," and "It is not lawful for a man to take his brother's stick without his good pleasure." Even if the husband assisted his wife in purchasing something, this does not permit him to dispose of it without her permission, unless he stipulated a return for his assistance.