[Therein are] gardens of perpetual residence which the Most Merciful has promised His servants in the unseen. Indeed, His promise has ever been eminent.1
Gardens of residence and permanence, which the Merciful promised His servants in the Ghaib that He will make them enter them. They did not see them but they believed in them. Allah’s promise of Paradise - even though it is in the Ghaib - will most certainly come to pass.