P. Derek Overfield PhD Thesis - Research@StAndrews:FullText

made in an earlier tradition.
Furthermore, again
differently from Ephesians and 1 Corinthians, no
obvious relationship exists between the citations.
But this is in fact not really the case.
There is
a relationship, albeit a negative one, between the
two texts as we shall show.
The author of the epistle
cites Ps 109:1 in 1:13 in such a way that two of the
traditions associated with the psalm text -
session
and subjection -
are referred to explicitly, and the
third traditional interpretation, that associated
with the xup~o,
title, is at least assumed,129 but
yet the author makes no comment on, nor adduces any
theological proof from, the psalm text at this point.
This is deliberate.
The citation of Ps 109:1 is
not used in relation to Christ's final victory but
only as a proof text to demonstrate his superiority
over angels.
The author introduces Ps 8:6 into his
text and it is now this citation that he uses to
expound the themes of both victory and dominion.
In other words it seems as if the author has
deliberately chosen to explain these themes in terms
of Ps 8:6 rather than use Ps 109:1, though he also
made use of this latter citation.
The choice of
Ps 8:6 to express victory and dominion instead of
Ps 109:1 is precisely the same choice made by the
author(s) of 1 Corinthians and Ephesians.
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