RSV translated {{bibleverse||Psalm|45:6}} as "Your divine throne endures for ever and ever." Paul's reading of God's promise to Abraham is from a different Septuagint text than the translation given above.
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Paul's reading of God's promise to Abraham is from a different Septuagint text than the translation given above. The human author of Psalms intended "O God" as a deification of the king. Paul interprets it as a reference to Jesus.