Musnad Ahmad 27:120

Sufyan narrated to us, from Zayd ibn Aslam, that he heard Ibn Umar say to his son, Abdullah ibn Waqid: "O my son, I heard the Messenger of Allah, may Allah bless him and grant him peace, say: 'Allah, the Almighty and Majestic, will not look at the one who drags his lower garment out of pride.'"