The word(s) "enemy" appears 31 time(s) in 28 verse(s) in Quran in Abdullah Yusuf Ali translation.

(11) So by deceit he brought about their fall: when they tasted of the tree, their shame became manifest to them, and they began to sew together the leaves of the garden over their bodies. And their Lord called unto them: "Did I not forbid you that tree, and tell you that Satan was an avowed enemy unto you?"

(12) They said: "We have had (nothing but) trouble, both before and after thou camest to us." He said: "It may be that your Lord will destroy your enemy and make you inheritors in the earth; that so He may try you by your deeds."

(13) Behold! Allah promised you one of the two (enemy) parties, that it should be yours: Ye wished that the one unarmed should be yours, but Allah willed to justify the Truth according to His words and to cut off the roots of the Unbelievers;-

(14) But if the enemy incline towards peace, do thou (also) incline towards peace, and trust in Allah: for He is One that heareth and knoweth (all things).

(15) If, then, Allah bring thee back to any of them, and they ask thy permission to come out (with thee), say: "Never shall ye come out with me, nor fight an enemy with me: for ye preferred to sit inactive on the first occasion: Then sit ye (now) with those who lag behind."

(16) And Abraham prayed for his father's forgiveness only because of a promise he had made to him. But when it became clear to him that he was an enemy to Allah, he dissociated himself from him: for Abraham was most tender-hearted, forbearing.

(17) It was not fitting for the people of Medina and the Bedouin Arabs of the neighbourhood, to refuse to follow Allah's Messenger, nor to prefer their own lives to his: because nothing could they suffer or do, but was reckoned to their credit as a deed of righteousness,- whether they suffered thirst, or fatigue, or hunger, in the cause of Allah, or trod paths to raise the ire of the Unbelievers, or received any injury whatever from an enemy: for Allah suffereth not the reward to be lost of those who do good;-

(18) Said (the father): "My (dear) little son! relate not thy vision to thy brothers, lest they concoct a plot against thee: for Satan is to man an avowed enemy!

(19) Say to My servants that they should (only) say those things that are best: for Satan doth sow dissensions among them: For Satan is to man an avowed enemy.

(20) "'Throw (the child) into the chest, and throw (the chest) into the river: the river will cast him up on the bank, and he will be taken up by one who is an enemy to Me and an enemy to him': But I cast (the garment of) love over thee from Me: and (this) in order that thou mayest be reared under Mine eye.