But that aside, there is strong evidence to support the possibility that the original recipients of Hebrews were Jewish Christians of the Dispersion (the scattering of the Jews outside Palestine) and no longer had the familiar and visible institutions of the Jewish religion. They were possibly confused by the glory of Jesus being veiled in suffering, now hidden in heaven. They too were subject to suffering and shame for their confession of Jesus. Thus the writer's drilling down on the Priesthood of Jesus, in expository form comparing it to the things of the old covenant, the wilderness unfaithfulness, the great cloud of the faithful as our witnesses, and His fulfillment of that covenant with His own sacrifice, once for all. They did not need the old institutions to be reconciled to God.
The heart of Hebrews is exhortation----encouragement---calling his readers to active and courageous response, continuing in righteousness, holding fast to the faith