“For example, to which one of the angels did he [Jehovah God] ever say: ‘You are my son; I, today, I have become your father’? And again: ‘I myself shall become his father, and he himself will become my son’?

In Heb 1 verse 5 Paul first quoted what God said in Psalm 2:7. Then Paul wrote “and again” before giving a second quotation (2 Samuel 7:14) and applying it to the Messiah, Jesus.