“Come, everyone who thirsts,
come to the waters;
and he who has no money,
come, buy and eat!
Come, buy wine and milk
without money and without price.
Why do you spend your money for that which is not bread,
and your labor for that which does not satisfy?
Listen diligently to me, and eat what is good,
and delight yourselves in rich food.
(Isaiah 55:1-2 ESV)
The Gospel Transformation Bible's notes for this passage include this wonderful thought:
His bounteous goodness is only for those who resist the impulse to pay for it. His love and grace come to us not because we have been so good but because he has been so gracious.