James Trimm’s Nazarene Commentary on Isaiah Chapter 14

14:12-15

12 How are you fallen from heaven, O Hallel, son of the morning! How are you cutdown to the ground, that did cast lots over the nations!
13 And you said in your heart, I will ascend into heaven, above the stars of El will I exaltmy throne, and I will sit upon the mount of meeting, in the uttermost parts of the north;
14 I will ascend above the heights of the clouds; I will be like Elyon.
15 Yet you shall be brought down to Sh’ol; to the uttermost parts of the pit.
(Isaiah 14:12-15 HRV)

This figure is clearly a [fallen] angel who is the spiritual King of Babylon as we read in the Midrash Rabbah:

R. Hunia said with reference to the dictum of R. Isaac: The Holy One, blessed be He, does not punish a nation on earth till He has cast down its guardian angel from heaven. This is borne out by five Scriptural verses. …The second is: How art thou fallen from heaven, O day-star, son of the morning! after which we read, How art thou cut down to the ground (Is. 14:12).
(Song of Songs Rabbah VIII:19)

From this portion of Isaiah we learn that HaSatan directly rebelled against YHWH, seeking to put himself (his own opinions) above YHWH (YHWH’s Word).

14:24-25

24 YHWH Tzva’ot has sworn, saying: Surely as I have thought, so shall it come to pass; and as I have purposed, so shall it stand:
25 That I will break the Assyrian in My land, and upon My mountains tread him under foot; then shall his yoke depart from off them, and his burden depart from off their shoulder.
(Isaiah 14:24-25 NHRV)

the Assyrian The Ancient Nazarene Commentary on Isaiah, in its commentary on Isaiah 31:6-9 interprets “the Assyrian” as HaSatan.

tread him under foot In Bereshit we read:

14 And YHWH Elohim said unto the serpent: Because you have done this, cursed are
you from among all cattle, and from among all beasts of the field. Upon your belly shall you go, and dust shall you eat all the days of your life.
15 And I will put enmity between you and the woman, and between your seed and her seed. They shall bruise your head, and you shall bruise their heel.
(Gen. 3:14-15 HRV)

See commentary on Bereshit (Genesis 3:14-15)