hey teraside,,
You are doing close scrutiny man!! If you are using NASB (i hope the old version of NASB, not the updated) I will say it is my personal favorite. Not that the other versions are inferior, but I like this language. I also use NKJV.
anyway, the answer to your question is .... In my Bible (NASB) in the margin, the 'again' part is implied as it should be coming as ..." And again when He brings the first born....."
WHat I understand is God is speaking that Jesus is exalted above the angels and God is making different points on that..
1. For to which angel did He ever say " You are My Son.....
2. And again: " I will be to Him a Father, And He shall.....
3. And again, when He brings the firstborn into the world....." I will be a Father to Him.....
I hope the way I wrote is self explanatory. The word 'again' is used only to emphasis each point that speaks of Jesus exalted above the angels and He being God's Son.
1st point.... And again,... 2nd point. And again,.... 3rd point. You understand??
But it is confusing when it comes like ..." And when He again brings...". I hope I am explaining it right.
But even if 'again' comes after 'He' it never means that Jesus will be born physically into this world a second time. There are intepretations that 'again' refers to the Second Coming. Even that view is ok, as it does not contradict any other scripture coz when He again comes.... that is in His second coming on the clouds....He will still be worshipped by the angels.
But in either way, it will never mean, Jesus will have a second physical birth.
By the way, the word firstborn shows the preeminence or superiority to the creation.
I hope I made it clear teraside.
God bless you!