Anas reported Allah's Messenger (ﷺ) as saying
When Allah fashioned Adam in Paradise, He left him as He liked him to leave. Then Iblis roamed round him to see what actually that was and when he found him hollow from within, he recognised that he had been created with a disposition that he would not have control over himself.
A hadith like this has been narrated on the authority of Humaid with the same chain of transmitters.