Isaiah 55 - Lesson 3: An Unfathomable Promise

We have seen at length that this life we live has more meaning to it than just getting through.
Today, we see in verses 3-7, that God gives us an explosive and incredible promise that connects to our eternity as believers.
What is this prenominal promise?
It is something connected to a man by the name of David.
And I wonder...what was his title...???