Hebrews 1:8 is QUOTING the Psalms:
But the author of Hebrews makes it clear that the Psalm is talking about GOD the SON.
Quoted From Ps. 45
In addition to the above admissions by trinitarian translators and scholars concerning Heb. 1:8, we need to look back at the Old Testament Hebrew scripture (Ps. 45:6) that Paul was quoting when he wrote Heb. 1:8.
The RSV renders it as “Your Divine throne” and a footnote provides this alternate
reading: “Or ‘your throne is a throne of God.’”
The NRSV says in a footnote: “Or ‘your throne is a throne of God.’”
The NEB says: “Your throne is like God’s throne.”
The Holy Scriptures (JPS version) says: “Thy throne given of God.”
The Bible in Living English (Byington) says: “God is your throne.”
New International Reader’s Version (NIRV): “Your throne is the very throne of God.”
The Good News Bible (GNB), a trinitarian paraphrase Bible, renders it: “The kingdom
that God has given you will last forever and ever.”
The REB has: “God has enthroned you for all eternity.”
The NJB gives us: “your throne is from God.”
Leeser - “Thy throne, given of God, endureth for ever”
We also see the following statement by respected trinitarian scholars in a footnote for this passage:
“45:6 O God. Possibly the king’s throne is called God’s throne because he is God’s appointed regent. But it is also possible that the king himself is addressed as ‘god.’” - Ps. 45:6 f.n. in the NIV Study Bible (1985).
In addition to the above renderings by many respected translators (most of whom are trinitarian), we have the statement by a noted scholar of Biblical Hebrew, H. F. W. Gesenius. In his famous and highly respected Hebrew and Chaldee Lexicon to the Old Testament Gesenius renders Ps. 45:6, “thy throne shall be a divine throne.”