1:6 And again. This reference to the coming Son is from II Samuel 7:14. The terms of that particular promise to David had a precursive fulfillment in Solomon, but its eternal terms could apply only to the coming Messiah.
1:6 he saith. From Psalm 97:7, where the angels are called “gods.” In the psalm, the “gods” are evidently fallen angels who have promoted pagan worship of themselves. However, its citation in Hebrews indicates that all angels, whether faithful or fallen, are commanded to worship (which means, essentially, to bow down to the will of God) the true God of creation.