This is the same Holy Spirit that is granted all who truly believe.
This was the passage Jesus read in the synagogue of Nazareth right after his temptation in the wilderness at the very beginning of his ministry.
We are still in the year of the LORD’s favor, but before the day of vengeance, the age of grace.
A more exact translation: A Kingdom of Priests.
According to Mosaic Law the firstborn receives a double portion.
The everlasting covenant between the Father, the Son and the Holy Spirit existed before the beginning of time, before creation. The manifestation on Earth happened at the appointed time.