Sahih Muslim Book - 45, Hadith - 6649

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ ، حَدَّثَنَا يُونُسُ بْنُ مُحَمَّدٍ ، عَنْ حَمَّادِ بْنِ سَلَمَةَ ، عَنْ ثَابِتٍ ، عَنْ أَنَسٍ ، أَنَّ رَسُولَ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: لَمَّا صَوَّرَ اللَّهُ آدَمَ فِي الْجَنَّةِ تَرَكَهُ مَا شَاءَ اللَّهُ أَنْ يَتْرُكَهُ ، فَجَعَلَ إِبْلِيسُ يُطِيفُ بِهِ ، يَنْظُرُ مَا هُوَ ، فَلَمَّا رَآهُ أَجْوَفَ عَرَفَ أَنَّهُ خُلِقَ خَلْقًا لاَ يَتَمَالَكُ.

It was narrated from Anas that the Messenger of Allah (s.a.w) said: "When Allah formed Adam in Paradise, He left him for as long as Allah willed He should leave him. Iblis started walking around him, looking at him, to see what he was. When he saw that he was hollow, he knew that he had been created in such a way that he would not be able to keep control."