Musannaf Ibn Abi Shayba 37:496

Waki’ narrated to us, from ‘Ubadah bin Muslim al-Fazari, from Jubayr bin Abi Sulayman bin Jubayr bin Mut’im, from Ibn ‘Umar, that the Prophet (peace and blessings of Allah be upon him) used to say in his supplication: "O Allah, I seek refuge in You from being taken by surprise from beneath me," meaning the swallowing up [by the earth].