Please contribute generously in order to ensure the continuity of our website InshaAllah.
Praise be to Allah.
If the man has already donated the piece of land for building a mosque, then it should be used for that purpose, and he cannot go back on his donation. But if it is the case that all that has happened is a promise to donate land for a mosque, it is better for him to keep his promise. May Allaah bless our Prophet Muhammad and his family and companions.