Allah the Almighty recounted this third lesson Adam learned in Paradise: And indeed We made a covenant with Adam before, but he forgot, and We found on his part no firm will-power. And (remember) when We said to the angels "Prostrate yourselves to Adam." They prostrated (all) except Iblis, who refused. Then We said: "0 Adam! Verily, this is an enemy to you and to your wife. So let him not get you both out of Paradise, so that you be distressed in misery. Verily, you have (a promise from Us) that you will never be hungry therein nor naked. And you (will) suffer not from thirst therein nor from the sun's heat."
Then Satan whispered to him, saying: "0 Adam! Shall I lead you to the Tree of Eternity and to a kingdom that will never waste away?" Then they both ate of the tree, and so their private parts appeared to them, and they began to stick on themselves the leaves from Paradise for their covering. Thus did Adam disobey his Lord, so he went astray. Then his Lord chose him, and turned to him with forgiveness, and gave him guidance.
(Allah) said: "Get you down (upon the earth), both of you, together (from Paradise), some of you are an enemy to some others. Then if there comes to you guidance from Me, then whoever follows My Guidance shall neither go astray, nor fall into distress and misery. But whosoever turns away from My Reminder (i.e. neither believes in this Qur'an nor acts on its orders, etc.) verily, for him is a life of hardship, and We shall raise him up blind on the Day of Resurrection."
He will say: "0 my Lord! Why have you raised me up blind, while I had sight (before)." (Allah) will say: "Like this, Our Ayat (proofs, evidences, verses, lessons, signs, revelations, etc.) came unto you, but you disregarded them (i.e. you left them, did not think deeply in them, and you turned away from them), and so this Day, you will be neglected (in the Hell-Fire, away from Allah's Mercy).
And thus do We requite him who transgresses beyond bounds i.e. commits the great sins and disobeys his Lord (Allah) and believes not in His Messengers, and His revealed Books, like this Quran. etc., and believes not in the Ayat (proofs, evidences, verses, lessons, signs, revelations, etc.) of his Lord, and the torment of the Hereafter is far more severe and more lasting. " Surah 20: 115-127