dear sir , i own a property in lucknow. i made a deal with a person to sell the property. an agreement was signed between us and he gave us the token money. now, he has backed from the deal due to some personal reasons and we agree with it. we are ready to give him the token money. we have the original agreement document. what other documents should i take from him before giving him the money. someone told me to get written slip signed by him that he will not have any relation with any matter related with the property mentioned.