What the Bible says about Firstborn of Humanity
(From Forerunner Commentary)
This relationship between the firstborn and the Feast of Unleavened Bread is repeated later in Exodus 34:18-20.
Staff
The Law of the Firstborn
Paul is is exalting Jesus Christ, which is important to his argument, as we see in chapter 2. First, we have the gospel, where truth concerning this situation resides. He exalts Christ by using the word translated "firstborn" two different times. In one section, he emphasizes chronological preeminence: Christ was before all. The second time, he gives status preeminence: Christ was not only before all, but He also has authority over all.
John W. Ritenbaugh
The Covenants, Grace, and Law (Part Twenty)