Oecumenius : "by the one who said to him." As through God. For God spoke through David, "So much better is Jesus." "For," he says, "they indeed became priests without an oath, but Christ has become a high priest with an oath. And this would not have happened, he says, if the difference were not great. Therefore, there is also a great difference between the new and the old." "the Guarantor [Έγγυος]." Like a guarantor [ἐγγυητὴς], Mediator. — The Pseudo-Oecumenian Catena on Hebrews Theodoret of Cyrus : Since the New Covenant promised us the kingdom of heaven, resurrection from the dead and life everlasting, though none of these is in sight, he had to call the Lord Jesus its "surety," who through his own resurrection confirmed the hope of our resurrection, on the one hand, and on the other continued to give his own resurrection through the miracles worked by the apostles. — INTERPRETATION OF Hebrews 7