It's such a stupid thing to say too. I got into an argument with a relative about it recently. By the Bible's own rules, a Christian who tells someone hungry to pray a little harder instead of just feeding them isn't a Christian, and they're damned. This whole "God helps those who help themselves" bootstrap/prosperity Christianity is the worst type of religion.

What good is it, my brothers and sisters, if someone claims to have faith but has no deeds? Can such faith save them? Suppose a brother or a sister is without clothes and daily food. If one of you says to them, “Go in peace; keep warm and well fed,” but does nothing about their physical needs, what good is it? In the same way, faith by itself, if it is not accompanied by action, is dead.

But someone will say, “You have faith; I have deeds.”

Show me your faith without deeds, and I will show you my faith by my deeds. You believe that there is one God. Good! Even the demons believe that—and shudder.

James 2 14-19