The author of Hebrews wrote to a struggling Jewish church, announcing everything had changed. All the requirements of the law had been met, all the promises of the prophets fulfilled, and the new and better covenant had arrived in Christ. Jesus is better.
Long ago, at many times and in many ways, God spoke to our fathers by the prophets, but in these last days he has spoken to us by his Son, whom he appointed the heir of all things, through whom also he created the world.
– Hebrews 1:1-2