What is the ruling on the money that a wife recovered from her husband in exchange for her spending on him, their home, and herself over the course of 4 years, with his agreement for her to recover it from his share in a project that has not yet started, and is he entitled to take a part of it despite his prior agreement to her work and his not stipulating taking any part of her salary?

If you spent your money on your husband and his home as a voluntary donation, then you have no right to claim it back. This is based on the Prophet Muhammad's (peace be upon him) sayings: "It is not permissible for anyone to give a gift and then take it back, except a father concerning what he gives to his child," and "The one who takes back his gift is like a dog that vomits and then returns to eat its vomit."

However, if you spent your money with the intention of getting it back from him, then your reclaiming it is permissible, and he must return it to you. If he refuses, you have the right to take the matter to court.

If you spent on him to prevent him from divorcing or harming you, then there is a difference of opinion regarding your right to reclaim it. This is because she might have given the gift out of fear of his anger or harm, and her soul was not truly content with the gift.