Q 1:
A man gave his brother a car as a present, then the person to whom the car was given wanted to sell it. Is it permissible for the person who gave it to buy it again?
A:
It is not permissible for the person who gave the gift to buy what he had given to his brother.
`Umar (may Allah be pleased with him) narrated: I donated a horse in the path of Allah. Its owner made it languish. I thought that he would sell it at a cheap price. I asked Allah's Messenger (peace be upon him) about it, whereupon he said:
Do not buy it and do not take back your charity, for one who takes back a charity is like a dog which swallows its vomit.
(Agreed upon by Al-Bukhari and Muslim).
May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.