Isaiah 9:5-6 is the promise of Prince of Peace
Luke 1:31-33 fulfills the promise
“And behold, you will conceive in your womb and bear a son, and you shall call his name Jesus. He will be great and will be called the Son of the Most High. And the Lord God will give to him the throne of his father David, and he will reign over the house of Jacob forever, and of his kingdom there will be no end.”
https://youtu.be/5XWY_OmEG1Q Unto Us Matthew West