Musnad Ahmad 27:928

Hassan ibn Musa narrated to us, Shaiban narrated to us, from Yahya, from Muhammad ibn Abd al-Rahman—meaning Ibn Thawban, the freed slave of Banu Zuhrah—that he heard Ibn Umar say: The Messenger of Allah, may Allah bless him and grant him peace, said: "Allah will not look at the one who drags his lower garment out of pride."