The word(s) "oppressors" appears 13 time(s) in 13 verse(s) in Quran in Mohsin Khan translation.

(11) And to (the people of) Madyan (Midian), We sent their brother Shu'aib. He said: "O my people! Worship Allah (Alone) and hope for (the reward of good deeds by worshipping Allah Alone, on) the last Day (i.e. the Day of Resurrection), and commit no mischief on the earth as Mufsidun (those who commit great crimes, oppressors, tyrants, mischief-makers, corrupters). [Tafsir At-Tabari]

(12) The recompense for an evil is an evil like thereof; but whoever forgives and makes reconciliation, his reward is with Allah. Verily, He likes not the Zalimun (oppressors, polytheists, and wrong-doers).

(13) And whomsoever Allah sends astray, for him there is no Wali (protector, helper, guardian) after Him. And you will see the Zalimun (polytheists, wrong-doers, oppressors): when they behold the torment, they will say: "Is there any way of return (to the world)?"