Musnad Ahmad 28:615

Hammad ibn Khalid narrated to us, Hisham ibn Sa’d narrated to us, from ‘Amr ibn Shu’ayb, from his father, from his grandfather ‘Abdullah ibn ‘Amr: The Messenger of Allah (may Allah bless him and grant him peace) was asked about a man who enters a garden. He said: "He may eat, without taking [any] away in his garment."