Tafsir of Al-Mujadilah 58:20

(Indeed, those who oppose Allah and His Messenger): This is an initiation [of speech] presented to provide the cause for what preceded it regarding the loss of Satan. He expressed them using the relative pronoun [“those who”] to condemn them for what is contained within the relative clause and to signal the reason for the judgment.

(Those):—the ones described by what was mentioned—(are among the most abased): that is, among the company of those who are the most abased of the creation of Allah, Exalted and Majestic is He, from the first [generations] to the last. They are counted among their number, because the abasement of one of the two opposing parties is in proportion to the might of the other. Since the might of Allah, Exalted and Majestic is He, is infinite, the abasement of those who opposed Him is likewise.