This text from Isaiah 55 comes at the end of a 15 chapter section detailing God's plan to redeem his people according to his unending love for them. After explaining how this salvation would be accomplished, and what exactly the benefits would be for those who received it, the invitation rings out: "All who are thirsty, come to the waters! All who are hungry, come to the feast!"
In Jesus Christ, your salvation is already accomplished. The question is this: Will you accept the offer?