Musnad Ahmad 27:891

Ali ibn Ishaq narrated to us, Abdullah informed us, Yunus informed us, from al-Zuhri, Salim informed me, that Ibn Umar narrated to him that the Messenger of Allah (peace and blessings of Allah be upon him) said: "While a man was dragging his lower garment out of pride, he was swallowed up by the earth, and he will continue to sink into it until the Day of Resurrection."