20:121
فَأَكَلَا مِنْهَا فَبَدَتْ لَهُمَا سَوْءَٰتُهُمَا وَطَفِقَا يَخْصِفَانِ عَلَيْهِمَا مِن وَرَقِ ٱلْجَنَّةِ ۚ وَعَصَىٰٓ ءَادَمُ رَبَّهُۥ فَغَوَىٰ
And Adam and his wife ate of it, and their private parts became apparent to them, and they began to fasten over themselves from the leaves of Paradise. And Adam disobeyed his Lord and erred.
Translation · Saheeh International
Tafsir
Ibn Kathīr (abridged)
The Story of Adam and Iblis
Ibn Abi Hatim recorded that Ibn `Abbas said, "Verily, man was named Insan only because he was given a covenant, but he forgot it (Nasiya)." `Ali bin Abi Talhah reported the same from Ibn `Abbas. Mujahid and Al-Hasan said that he forgot means, "He abandoned it." Concerning Allah's statement,
وَإِذْ قُلْنَا لِلْمَلَـئِكَةِ اسْجُدُواْ لاًّدَمَ
(And when We said to the angels: "Prostrate yourselves to Adam.") He, Allah mentions how Adam was honored and what respect was given to him. He mentions how He favored him over many of those whom He created. A discussion of this story has already preceded in Surat Al-Baqarah, Surat Al-A`raf, Surat Al-Hijr and Surat Al-Kahf. It will also be mentioned again at the end of Surah Sad. In this story, Allah mentions the creation of Adam and that He commanded the angels to prostrate to Adam as a sign of honor and respect. He also explains the enmity of Iblis for the Children of Adam and for their father, Adam, before them. Due to this Allah says,
فَسَجَدُواْ إِلاَّ إِبْلِيسَ أَبَى
(They prostrated themselves (all) except Iblis; he refused.) This means that he refrained from prostrating and became arrogant.