Musnad Ahmad 1153:523

Abu al-Mughirah narrated to us, al-Awza'i narrated to us, Abd al-Rahman ibn al-Qasim narrated to us, from his father al-Qasim ibn Muhammad, from Aisha, the wife of the Prophet, may God bless him and grant him peace, from the Prophet, may God bless him and grant him peace: "Indeed, the people with the severest punishment on the Day of Resurrection are those who imitate [the creation of God]."