'Old Testament' in the Bible

For God did not place the coming inhabited world [Note: "The coming inhabited world" here probably refers to the present Christian age. It was viewed as "coming" from the perspective of Old Testament times], under the control of angels [and] that is the world we are talking about.

for He says [Psa. 22:22], [Note: In the following three Old Testament quotations the writer represents Christ as the speaker] "I will declare your [i.e., God's] name to my brothers, [and] in the presence of the assembly I will sing [a hymn of] praise to you."

And He says in another place [Psa. 110:4], "You are a priest forever according to the order of Melchizedek." [Note: This is the first mention of this mysterious Old Testament priest who, throughout this book, is represented as a type of Christ].

because God had planned to give us something better [than they got], so that they would not be complete without us. [Note: The idea here is that these faithful people of Old Testament times did not receive the fullest of blessings until Christ came to make them available to both them and us together].