Liturgical quotations continue. Who worships the Son? In Hebrews and the Greek of Psalm 97, the angeloi, angels. In the Hebrew of Psalm 97, it's the "Gods," elohim. In the Greek of Deuteronomy 32:43, the huioi theou, sons of God. (This line is missing from the English translation and the Masoretic Hebrew, but it appears in Deuteronomy as discovered among the Dead Sea Scrolls.)
These are all the same thing. The Worship of the Shalems ordinance is how one becomes the light, which is to say, the Son, and a teleios / shalem, like the Father.
The "angels" in verse 7 are parallel and equivalent to the "ministers," which in Greek are leitourgoi, priests who perform ordinances. So we see for the umpteenth time that angels are priests.