Musnad Ahmad 30:2476

Yahya ibn Sa'id narrated to us, he said: Ibn 'Ajlan narrated to us, he said: Sa'id narrated to me, from Abu Hurayrah, from the Prophet, may Allah bless him and grant him peace, who said: "If one of you strikes, let him avoid the face, and let him not say: 'May Allah make your face ugly, and the face of whoever resembles your face,' for Allah, the Mighty and Majestic, created Adam in His image."