This verse is short, almost easy to skip past in a chapter full of bigger promises — ransom, covenant, return from exile. But notice it's addressed to two specific states: weary and faint. Not sinful, not unfaithful, not in exile even — just exhausted and running on empty. That's a category of need the rest of the chapter doesn't quite cover: sometimes the thing you actually need isn't rescue from an enemy or a new covenant, it's simply to be refreshed, because you're just plain tired. God doesn't respond to that weariness with a bigger assignment or a call to try harder. He responds with refreshment and satisfaction — rest that actually reaches the faintness, not just papers over it.