The five divisions of angels

1. Seraphims – Isaiah 6:1 ff
2. Cherubims – Ezekiel 1
3. Zoa – Living Creatures – Revelation 4
4. Archangels – 1 Thess. 4:16
5. Ministering Angels

The Angelic Beings
The Five Divisions of the Heavenly Host

Before the earth was created, angels were already in existence. In Job we read:

“Where were you when I laid the foundations of the earth? Tell Me, if you have understanding. 5 Who determined its measurements? Surely you know! Or who stretched the line upon it? 6 To what were its foundations fastened? Or who laid its cornerstone, 7 When the morning stars sang together, And all the sons of God shouted for joy?” (Job 38:4-7).
Morning stars and sons of God refer to angels.