Faqulna ya adamu inna hatha AAaduwwun laka walizawjika fala yukhrijannakuma mina aljannati (surah TaHa: 117)

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(20:117) At this, We said to Adam, *95 "He is an enemy to you and to your wife *96 . Be on your guard lest he should have you expelled from the Garden *97 and you find yourself in great distress.

Faqulnaa yaaa Aadamu inna haazaa `aduwwul laka wa lizawjika falaa yukhrijan nakumaa minal Jannati fatashqaa

*95) Here the Command, which was given to Prophet Adam, has not been mentioned, which was: "You must not eat the fruit of this tree." This has been mentioned at other places but has been omitted here because the emphasis here is on this weakness of man that he is easily seduced by Satan in spite of the forewarnings and admonitions to this effect.
*96) Both knew that Satan was their enemy, for Adam himself had witnessed the demonstration of his enmity, when he had refused to bow down before him and declared in plain words, "I am better than he; Thou didst create me of tire and him of clay". (VII: 12, XXXVIII: 76, see also XV: 33). "Should I bow before the one whom Thou hast created out of clay?" And then added, "Just consider was he worthy of this that Thou hast exalted him over me?" (XVII: 61-b2). Then Satan did not rest content with this bragging of superiority but evinced his jealousy by giving an open challenge that he would prove it by seducing Adam. (VII: 16, 17; XV: 36-42; XVII: 62-6b; XXXVIII: 82-83).
*97) This was to forewarn both of them of the consequences of disobedience of the Command.