Musannaf Ibn Abi Shayba 21:158

Al-Fadl ibn Dukayn narrated to us, 'Ubadah ibn Muslim al-Fazari narrated to us, Jubayr ibn Abi Sulayman ibn Jubayr ibn Mut'im narrated to us, claiming that he was sitting with 'Abdullah ibn 'Umar, and he said: I heard the Messenger of Allah (may Allah bless him and grant him peace) saying in his supplication when he reached the evening and when he reached the morning—he did not abandon it until he departed from the world or until he died: "O Allah, I ask You for well-being in the world and the Hereafter. O Allah, I ask You for pardon and well-being in my religion, my worldly life, my family, and my wealth. O Allah, conceal my faults and secure my fears. O Allah, protect me from before me and from behind me, and from my right and from my left, and from above me, and I seek refuge in Your greatness from being swallowed up from beneath me." Jubayr said: "And it is the sinking (al-khasf)," and I do not know if it is the statement of the Prophet (may Allah bless him and grant him peace) or the statement of Jubayr.