The word(s) "opponent" appears 6 time(s) in 6 verse(s) in Quran in Mohsin Khan translation.

(1) And of mankind there is he whose speech may please you (O Muhammad صلى الله عليه وسلم), in this worldly life, and he calls Allah to witness as to that which is in his heart, yet he is the most quarrelsome of the opponents.

(2) He has created man from Nutfah (mixed drops of male and female sexual discharge), then behold, this same (man) becomes an open opponent.

(3) Nay, but they (the so-called gods) will deny their worship of them, and become opponents to them (on the Day of Resurrection).

(4) These two opponents (believers and disbelievers) dispute with each other about their Lord: then as for those who disbelieved, garments of fire will be cut out for them, boiling water will be poured down over their heads.

(5) Does not man see that We have created him from Nutfah (mixed male and female sexual discharge - semen drops). Yet behold he (stands forth) as an open opponent.

(6) [Dawud (David)] said (immediately without listening to the opponent): "He has wronged you in demanding your ewe in addition to his ewes. And, verily, many partners oppress one another, except those who believe and do righteous good deeds, and they are few." And Dawud (David) guessed that We have tried him and he sought Forgiveness of his Lord, and he fell down prostrate and turned (to Allah) in repentance.