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

(11) He said: "My Lord! Give me victory over the people who are mufsidun (those who commit great crimes and sins, oppressors, tyrants, mischief-makers, corrupters).

(12) 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]

(13) Shall We treat those who believe (in the Oneness of Allah - Islamic Monotheism) and do righteous good deeds as mufsidun (those who associate partners in worship with Allah and commit crimes) on earth? Or shall We treat the Muttaqun (the pious - See V.2:2) as the Fujjar (criminals, disbelievers, the wicked)?