Abraham accepted Ephron's offer and paid him the 400 pieces of silver in front of everyone at the city gate. That's how Abraham came to own Ephron's property east of Mamre, which included the field with all of its trees, as well as Machpelah Cave at the end of the field.
Look at the birds in the sky! They don't plant or harvest. They don't even store grain in barns. Yet your Father in heaven takes care of them. Aren't you worth much more than birds?