What is Allah’s warning to those who avoid spending wealth in His cause?

1. Here you are then: people who are called upon to spend in the Way of Allah and then some of you are tight-fisted! But whoever is tight-fisted is only tight-fisted to himself. Allah is Rich and you are poor. If you turn away, He will replace you with a people other than yourselves and they will not be like you.
(47:38)