1.You have not yet sold the said property,
2. You have agreed to sell it and made verbal agreement ( I am not going to the question as to how such a valuable property can be agreed to be sold and/or given possession of without any written agreement),
3. You have not conveyed the title of the property which is still with you,
4. Issue hima legal notice refunding him the advance paid by him after forfieting and deducting 10% of the advance paid by him and asking him to vacatre your place within 15 days,
5. In cae he fails, file a complaint of trespassing if you have not given him any possession letter,
6. If you have given him a written possession notice, you can not file a case for trespassing. You shall have to file an eviction suit.