Brief Angel Definition
Angels can be thought of as God’s assistants, Who makes his angels spirits, His ministers a fire (Ps. 104.4). Often a military aspect is observed as a vital role given angels, For he will command his angels concerning you to guard you in all your ways (Ps. 91.11 NRSV). Also, Michael and his angels conduct war, Then war broke out in heaven. Michael and his angels fought against the dragon, and the dragon and his angels fought back. (Rev. 12.7 NIV).
The Septuagint was a Greek translation of the Hebrew Bible (O.T.) translated as early as 3rd century BCE (Torah) and 2nd century BCE (Prophets and writings). It translates the Hebrew term for angel (mal akh) into the Greek angelos. Both Hebrew and Greek terms denote the concept of “messenger.” Therefore, the good angels seem to be messengers of words or deeds from God. Angels are also divided into ranks, which involve hierarchical relationships that can be seen by the term “archangel” in places like Jude 9.
Replacing Fallen Ranks
Peter was resurrected Jesus’ initial spokesperson of the nascent Church. He recognized the need to fill the post that Judas deserted among the Twelve to make up that number, Therefore it is necessary to choose one of the men who have been with us the whole time the Lord Jesus was living among us (Acts.1.21 NIV). Peter quotes Ps. 109.2 to make the point that a formal and established office existed of those whom Jesus had chosen, Let his days be few, his office, let another take (Acts 1.20b). In the scriptures, it seems that some ministries and offices are meant to be filled up to a certain number.
Therefore, it seems that since some angels have fallen, their ranks need to be filled. This concept aligns well with what Jesus describes as the believer’s afterlife in Lk. 20. 35-36a, But those who are considered worthy of taking part in the age to come and in the resurrection from the dead will neither marry nor be given in marriage, and they can no longer die; for they are like the angels (NIV). I have argued elsewhere https://beliefspeak2.net/ that the imprisonment of evil angels that Peter speaks about in 2Pet. 2.4 is best fulfilled by the first day of creation (re-creation) in Gen. 1. 2-4. If I am correct in my reading, then what we see in Genesis, from the first day onward, is a divine plan to raise up replacements for the angels who have fallen. Of course, this is not the only purpose of God in redemption, but one to praise our Savior forever.