I made a promise to sell my property to a friend for R1 million after two months.

Answer

A verbal agreement is just as valid as a written agreement in terms of the Shariah. However, in the case mentioned you may sell your property for R1,900,000 to the other person. The agreement to sell the land in January was a promise. It was not a concluded transaction. Now that you have received a higher offer, you are entitled to sell it to the highest bidder.